witchers don't retire though, that isn't part of the lore of the witcher and isn't consistent at all. know the saying ' a witcher never dies in his bed ' actually it might be sleep not sure.
vesimir was much older than geralt and still the best maybe only surpassed in skill by Geralt.
If they were to move forward with the series I think it would be silly to just simply retire him. but then again they might just make a game during a different time period, although I think most people would say what they love about this series, one of things is the interesting characters, so a different time period would exclude all those interesting characters.
Like I've said I think tw3 could use a little work before laying it to rest and address some of what many have suggested and written about on here, but If i'm to only get these 3 games with Geralt for the rest of my life then I at least hope they make high quality remakes down the road, god knows witcher1 could use a graphical and gameplay overhaul by now.