I'm skeptical for a lot of reasons. One, PC gaming is littered with new tech game developments that never go anywhere. Remember physics cards? Remember things like Hairworks?
Another reason is that even when the tech does take hold, it can take YEARS for it to happen. Directx 12, or any previous DX version, is an example. How long has DX 12 been around? How many games make use of it? Can you still game with DX 11 components? Of course. So by the time DX 12 means something, years of these early adopter cards will be out of date.
So I think there will be some games that have some aspect of ray tracing patched into them, but the games will run fine on non ray tracing hardware because they weren't actually designed to use ray tracing from the ground up. It's going to take time for game developers to figure out how this tech works, then it's going to take more time for them to experiment with it in games. Then it's going to take time for them to optimize their games for maximum performance. At that point, this first batch of RTX cards will be too slow and everyone will be buying those future card to play those games.