Will you buy a new card when Nvidia will release a 4090 Ti? Let's say it is 10% better than the 4090 in RT, it should be if it is the full die. You should have no problem buying one since that is the best you can get for RT games.Based on their own charts, NVIDIA is a generation ahead when it comes to RT. Pricing is subjective. I always buy halo cards so I didn't really think the pricing of the 4090 was all that bad compared to the 3090. The 4080 is terrible though.
I would pay that premium for RT and DLSS because I just don't know what I would do with the higher FPS on the AMD card. Assuming I get 130 FPS with the 7900XTX, I will see no perceptible differences compared to the 70-80 FPS I was getting with the 3080 Ti without an FPS counter.