Hello everyone, first post, signed up just for this, simply couldn't resist.
I actually like the Idea of an Witcher-MMORPG.
Even if it will probably never come true, I imagine something like this:
Set in the past, where Witchers weren`t as uncommon as today, maybe even before/around the time Kaer Morhen was raided?
This would allow for a logic explanation why there are more monsters/less payment per monster and why there are more witchers.
Classes are pretty obvious I think, e.g. Hunter, Criminal/Thief, Knight/Soldier, Headhunter, Wizard/Sorcerer and ofcourse Witcher. If it is made WoW-Style, hardly anyone would like to play something beside the Witcher-Class. However, if it was made like the storysystem of Star Wars: The Old Republic, it gets more personal, which allows to keep the charm of the single player games while making the classes about equally attractive. The Idea of actually changing the story with my decisions could be kept, too.
As for the "job's" of a class, you could give different skill-trees to the classes like in WoW, as in "Alchemy, Swordmastery, Signs" for the Witcher or "Traps, Stealth, Chase" for the Hunter etc etc. Maybe add in more Diversity by making it a little like the "Inquisitor-> Become either an Assassin or a Sorcerer" of SW:toR.
Race could be more of a Problem, as there would be close to no reason for a Dryad to leave the Brokilon, but then again, this is way back in time, there may be more Dryads around/more battlefields than around the Brokilon.
You could also introduce the limitation-system of Star Wars: Galaxies or the "reach lvl x to make a twink of this class" of WoW to limit the number of Wizards and Witchers.
As for Factions, you could have the several Kingdoms vs each other, criminal xenophobic Organisations, the Witcher's schools, the Magicians Order. I already have an Idea for an Add-on, too: The Rise of the Empire =P
A "horde vs alliance" wouldnt make much sense with the world we`re dealing with here. More like the coloured-scarf
-system of Silkroad: Anyone thats not your team, is/might be an enemy.
All in all, Character creation would be: Male/Female, class, race, faction, cosmetic changes.
As for Quests, ignoring the storyline and a Witcher's/Hunter's, Knight's, Sorceress's daily work, you could have instances like the Raid of Kaer Morhen =D
So yeah, I`d love to see this and I`d definately play this, but there is no way this will ever be made, so this whole post is pointless. Also, the feeling would be TOTALLY different from Witcher 2. More like one, but still not there. And that`s something many people probably wouldnt like.
greetz