I can echo having a difficult time relating to the Geralt character, and would be all for a fantasy game where one could create/design their own character, but, I'm not sure the GoT universe would be the right setting.
If anything, I think I'd have a stronger preference for an open world fantasy RPG that draws from many different, well-loved fantasy series without necessarily being any one of those.
I'm a little partial to the concept of a Post-Post-Apocalyptic fantasy world that takes place well after the fall of a long dead high-technology civilization, where off-shoots of humanity or "races" could plausibly be the result of genetic tinkering and/or bio-weapons thousands of years ago, but, all that knowledge is lost and your character lives in a world that's basically swords and sorcery, with, perhaps, room for a tiny bit of sci-fi.
The benefits to drawing from a broad range of sources, however it could manifests, is that developer X, whether it's CDPR, or someone else, doesn't have any of the baggage that comes with something already established, and, they're not beholden to anyone regarding licensing, copyright, or any other nonsense.
I get that some folks want to see the world of XYZ portrayed as an open world game because they've enjoyed the books, movies, or TV shows, but, you have those already. Why cling to them? Sail over the horizon and claim new lands, and go on new adventures in new worlds that might be a little familiar, but, also new enough that some surprises can trip one up.
Eh. That's my spin.
It's a "no" from me for a GoT game.
Let's have something new, and different, something not married to some already established copyrighted already-done baggage-laden concept, something that allows for character creation.