Hopefully he isn't killed off by a butterfly like my man Deckard.
You haven't seen how books has ended, didn't you? Geralt already had one lame "death", I don't think they will repeat it lol
Also, the most recent book (Season of Storms) implied he was alive for at least 100 years after the last novel. One of Witcher 3 DLCs had some ties to that book, so it's safe to assume this story is canon
Funny for you to say that. Initial CDPRs idea was to actually let you create your own Witcher and even choose a proper school an origin. They scrapped the concept very early though and went with Geralt due to time and budget constraints. Plus it was way cheaper to model 1 fixed character instead of entire set of customizable parts (you'll be surprisied how little models TW1 used in general before the Enhanced Edition).
Geralt was always in this story, but originally he was a side character. His part in TW1 was very similar to what Berengar had in the final game. Originally they wanted to make a hack'n'slash game like Baldur's Gate: Dark Alliance and you indeed could create your own character and even pick a gender. They had to change an engine (original engine belonged to programmer who refused to move to Warsaw) and managed to licence Aurora from BioWare, which impacted their direction. When they started working with this engine they slowly shifted towards more narrative-oriented game and they felt that custom character like this may not work and they opted for a fixed protagonist instead
But initially it wasn't Geralt, but Berengar, the same guy I mentioned earlier. He was originally the protagonist of The Witcher 1. After a while CD Projekt decided to make yet another change and opted for making Geralt as a lead. But not for budget reason, but because of his recognizability. Geralt
was The Witcher and they felt a new protagonist may not be able to live up to his legacy. So they made this switch and Berengar's role was rewritten to occupy similar story Geralt had initially, but obviously with some changes as his personality and backstory were different. You can see earlier designs of Berengar in this trailer