It's going to take a while, or a lot of time until we will see most if not all games being developed with raytracing only. For now it's going to be like Control or Metro for most games.
The exact same way they have been doing it for the past two years, and basically how PCs are doing everything since they were invented - by give people choice, a.k.a. settings menu.
If it's mandatory that Xbox games release on PC, does that mean Xbox exclusive developers have to design their games around a non-Raytracing capable PC as the baseline?
It's too early to design a game around ray tracing. But indeed any raycast features will be gimped a lot. AI, pathfinding, visibility checks, audio, particle dynamics, shadows, occlusion, etc etc.
This is only taking into account the graphical side of things, what about A.I applications of ray tracing like that one developer recently mentioned? Are they gonna make two different A.I behaviors?
Exactly, I can understand the concern for how games being designed around a standard super fast SSD could be ported to non SSD machines but raytracing? Just toggle it off?