I don't see DXR taking off unless the next-gen consoles support it with good performance. And I'm doubtful if they'll be able to do both the expected minimum 1080p/1440p checkerboard rendering, High/Ultra graphics and then raytracing on top of that.
I still feel bitter when thinking of how Nvidia disabled using a PhysX card in combination with AMD
It's worse than PhysX. You could run PhysX on most Nvidia cards that were available at the time, and if you had an old card, you could use it as a PhysX processor. This ray tracing stuff seems to have a huge performance hit and Nvidia wants about 5 people on the planet to be able to afford it. It may be the future, but I don't think it will be Nvidia proprietary or RTX. I give it 10 years before it becomes any kind of actual thing. Seriously.
I still feel bitter when thinking of how Nvidia disabled using a PhysX card in combination with AMD