I don't think we will see a new Witcher game anytime soon, but after Cyberpunk 2077, who knows what direction will CDPR take, maybe Cyberpunk sequel, a new IP, maybe even a new Witcher. Personally I would love a new Witcher game with Geralt as a main protagonist, as much as I love Ciri, her being a main character is not something I would want. The Witcher universe is rich and can offer many possibilities for different stories to be told, but Geralt is such an amazing and well developed character that for me The Witcher without him wouldn't be the same. But even if we never get a new game, TW3 still rounds up the trilogy in a nice way and it's an appropriate ending to Geralt's journey.
He would probably be too fat anyway for Witcher 4 with all those cookies Triss is feeding him :sleepy: