There is a lot to say for that idea! And I agree with the 100th episode reference...I would think they could set TW3 version of this say, a few years after the end of the story...something that would draw everyone back together. Hate to make it another cataclysmic OMFG type thing but...if not that I don't see what...maybe the CRONES have re-spawned and are now drawing together all the RELICs, sapping their energy to rebuild their 'empire'...i don't know, just throwing that out there.
Yeah, understand that when I say an explosive end I don't mean killing Geralt off. I just mean one last rip roaring adventure that has several hours of content that ties up lots of the loose ends, rather than some largely pointless party that could be patched in as a scene. Don't get me wrong, I liked Citadel, but it's not something I feel would fit this game.