Much of what you are asking for by specifying your desire for 2077 to become an MMO can be provided through a combination of Single Player and Multiplayer, without the need to go as far as it being an MMO:
Maybe, but SimCity Online is a SP / MP, but the MP part doesn't work very well. Even your own cities are not working clearly in sync, and no one comes to your area to build their city. Even the new UFO game had multiplayer feature, but it lacks, because at first it was buggy and there are not many other players there if any. And the MP play is just matches, nothing much more.
Limitless Content:
I am yet to find an MMO that actually has limitless content. The vast majority of the content in MMO's is bland and repetative, you end up going to the same locations and doing the same things, maybe with different people. As Sard pointed out, this usually takes the form of grinding, (raids... yay... zzzzz.... oooh, I just need 200 goblin heads... how often do they spawn again?)
I can see a lot of conent being made available from the modding community, making their own missions, gear, clothing, locations, vehicles, weapons and even NPC's with sound packs that can provide a hell of a lot of new content. All of this can be done without even multiplayer. You can actually follow a deep and driven story that can branch in a multitude of directions. That is not really possible in an MMO, because everyone is playing the same story, (Hello rairoad ,my old friend!)
Mods are nice to have, but the stuff to do should be in the game itself. Maybe randomly generated dungeons and random adventures would help. But I still don't understand why SP games are any better? Sure you can embed dialogs and cut scenes in SP games more easily... But I don't care about them that much, if the game is challenging in itself. In Wow the normal dungeon runs were great, but then later they started to be just huge hallways, more hallways, and oh look again hallways. But I liked the dungeon runs as there were clear PvE goals in them.
I don't like PvP arenas so much, because you keep dieing there all the time. The same thing is with hard PvE raids, you keep dieing all the time. I like more if the difficulty level raises steadily, so you can keep going even if it is challenging, but at least you don't bang your head against a wall for weeks. PlanetSide 2 PvP is different, because there is not so much of an arena than an open world to fight in. You can join a large zerg that is operated onto hot spots, and there is a lot of things to do even if you don't want to stand in the front line. PS2 also has many kinds of things to do, as there are couple of factions, many character classes, vehicles, and planes. PS2 has character progression, too, and it isn't too steep either. But yeah, there is not much of any story, no long term territory control, or any such thing. It is constant fighting over places.
Territory Control/Property Ownership
In MMO's Territory Control is always linked to PvP. It also ends up being about who has a larger/better faction base in a given timezone. There are lots og games that work on this already, do we really need another one? (Oh, and I wouldn't bother refering to PS2 as it is an FPS, not an RPG.)
However, in a Single Player game you can still take territory and own property, but you wont get screwed over while your asleep.
Right, but PS2 is an MMO. It has RP elements, though sure it is really just an FPS. But there Cyberpunk could have done better. In Cyberpunk you have guns too, so you can do FPS, then just add RPG to it, too.
In any case, I don't believe that Cyberpunk will have such gameplay as in the trailer. Nowadays games have almost realistic video feed as trailers, but then the actual gameplay is more or less different. You drool over the trailer, but while the actual game can look amazing thanks to modern graphics, it can't be as amazing as the trailer.
What comes to graphics, I liked Wow graphics, because they were fluid and had fluid animations. In many games the graphics are more like jerky photos, which really breaks immersion. Wow graphics are not high tech, but they are fluid. PS2 graphics are fluid too, the game responds fast, which is one reason I like it. Skyrim feels more stickier, though I have good computer and don't use ultra-settings.
Social Interaction
Ok, Single Player games provide no social interaction at all. But there will be Multiplayer elements in 2077, (though they have yet to be identified.) I suggested having "communal area's" similar to the camps in Guild Wars. I think certain Bars and Clubs would be ideal for this. Have some of them act as black/grey markets where players can sell their loot or services while others act as meeting places where you can 'rent a room' to host an invitation only group. From these groups you could then form teams to go out and do missions co-operatively. Or how about dueling for money/loot or getting into pit fights?
This can easily solve any issues people have with a lack of social interaction.
MP elements don't still make it an MMO.
The Exception to the Rule
EVE Online breaks all the rules when it comes to MMO's. It is in a class of it's own. But then again, it also has a lot of rules that are all it's own. Ganking, Scamming and all sorts of other 'anti-social' behaviour are positively encouraged while other games would seek to prevent them. Also, the story - while rich, unique and intriguing - is barely important to the game and is largely ignored by the playerbase. This is because the player created content far out performs the actual content. What most people are interested in from expansions are the new toys, ship/module rebalances and maybe new locations to fuck everyone else over in.
The player driven economy is by far the most amazing feature of the entire game. My main characters net worth is about 30 - 40 billion isk, (though I haven't even bothered logging in for at least 4 months, so that should be more due to the battleship rebalancing...) damn I loved being an industrialist...
But overall, the storytelling side of the game sucks balls. The best way to actually get into the story is by reading the novels, (which are very well written.) I reccomend them to anyone and everyone.
Right, I enjoyed Eve incursion runs, as they are kind of PvE "dungeons". The incursions are somewhat harder than normal Eve missions, and incursions require you joining a group of players. It is fun to climb the ladder to get into better and better groups, so you beat other players. One problem here is, that the incursions were totally repetitive grinding that eventually cause headache, wrist damage, and nausea. PvE should be exciting, but not such that you clickety clickety click as fast as you can for hours. There needs to be natural breaks, story, sceneries, exploring, etc throughout the runs. Wow dungeon runs were better in that, because you waited for a group (a natural break), you did a dungeon (explored if it was a new dungeon), and so. Randomness would increase exploring.
I am all for a Cyberpunk 2020/2077 based MMO, but not at the expense of what CDPR have planned.
Good. Well, I know already that there will be no Cyberpunk MMO this time.