I think my point of view is different than last week, when I've finished the game and felt empty.
I'm not sure it would make sense to have an extension to the current story. Only an additional ending, clearly GOOD and POSITIVE, is missing in my opinion. They could make it hard as hell, this could require to replay the game and get a lot of milestones right, but it would help a lot (exemple > Biotechnica is able to clone V's body and make an offer they can't refuse // Johnny and V fuse and become a new entity, etc. > this forum is full of interesting ideas).
If they want to make a Chapter 2, CDPR would need to define some endings as canon while other would naturally be dismissed (ie : Suicide or Alt)
I assume any ending bringing V back to NC would do (exluding the Panam one, except if CDPR find a great motivation to justify V coming back to the city, which defeat the whole purpose of this ending).
But it would feel a bit forced to have V running after the same objective than during the whole game (getting a cure before 6 months), even if made a bit more tangible (like clones, that could be a forbidden technology etc.).
Alternatively, I can find endless ways DLC / Extensions could make the current game a lot better (gangs & factions influence and questlines (Netwatch, Voodoo Boys, etc.), capacity to change story outcomes (save characters or kill others), night activities).
The issue with the endings is compound.
1. The journey is very short and lacking depth and complexity. If I take out the 3 missions for the romance with Panam, that's even less content to get me to the final mission. The result is when you get to the final mission, it all feels a bit awkward and rushed. You don't feel as if you have achieved much getting there.
2. The romances, like the main story lack time. In my Panam romance there were 3 missions with which to carry out the 'romance'. This seemed to follow a loose framework of 'introduction' and teasing the player with the prospect of romance, then a 'filler' to build the relationship and showcase the character's want/need for each other, and finally the 'deal sealer' where the characters affirm there relationship (obligatory 10 second sex scene). Then you are given a 'doggy bag' of good feelings and returned to the main storyline. The endings dictate we must either leave behind those romances or take them with us, but in either instance they develop no further than a 'quickie'.
3. The dialogue presents options throughout with opposing reactions or opinions on the current event. Many of these options result in the same outcome (if I agree or disagree with someone or a plan, it makes no difference as we will follow that plan or person anyway). The decisions as a whole only ever subvert the fixed narrative for a short period, and ultimately snap back to the pre-set storyline. The endings are inevitable, we have only a minor say in how they transpire. Whilst ultimately V is destined to die immediately, die in months or die a digital ghost as AI.
4. The world ceases to exist beyond the ending. There is no option to return to NC and continue play. Some of this is dictated by the ending, but even where the ending does not stop you from returning to play, CDPR does. The only option is to return to a final save and play from there. The story and journey is abandoned under this principle. There is no rush to save your life, there is no journey to be experienced or decisions to partake in. There is no romance to develop or enjoy. You are left in a world with no friends or lovers, nothing beyond side missions and 100% completion to keep you immersed.
Some of the endings are absolutely fine because you survive. The minimum V expected from the journey was to see it to conclusion (get rid of Johnny). But the position of the endings in the timeline means that everything else is condensed to accommodate it. We can't have those drinks at the bar with Judy, or invite Panam over for some 'Netflix n Chill', or go to a club with Kerry because the ending is coming up in a couple of missions and there isn't time. We can't tell Takemura that we understand his stake in the game but we have bigger fish to fry, and other people to help us fry them because he HAS to take us to the conclusion. We continually sacrifice V's status as protagonist to give screen time to other characters, who for the most part are there to hurry us along to the endings