I don't think this will happen. You should start reading the books, really.
I discovered the games two months ago (better late than never
) and played TW1 without knowing the books. In the middle of TW2 I started reading the books.
Now I'm at the end of the 4th book and play the 3rd round of TW2 (to have different savegames for TW3). And I tell you : It's fantastic to play the game while reading the books! You now discover so many little things, lovely details you miss without knowing the books. Of course, these things and not that much relevant but they always put a smile on your face.
And CDPR did a great job (in opinion at least). The game world an its characters are really similar to the book.
And to get back to the topic : Ava Gardner would be perfect !