I wouldn't take anything for granted. NVIDIA rarely drops prices until a new release. They may well hang on until the 5000 series, and even then I would not bank on them reducing prices at all. On the contrary, you can perhaps just expect them to increase the price of the 5090, since people buying the 4090 have shown they are willing to pay the extra.
Fact is that NVIDIA have us over a barrel and they know it. People still crave that next purchase and while they do, NVIDIA have us by the shorts.
NVIDIA do not really have us in a closed market though, do they? AMD and Intel have products that compete up to RTX 4080 levels. Their only halo product is the RTX 4090, and sales have dropped off the cliff, now that early adopters are no longer buying in droves (price has dropped on RTX 4090 since its launch).
Also the price of the RTX 4080, has also slightly dropped since launch.
Roll on RTX 5090, we can hopefully get the AMD RT 8000 series at the same time and see if the AMD chiplets tech matures to a level which properly competes, at the high-end.
Also, AMD produce so many chips for Sony and Microsoft, while NVIDIA have the low powered Nintendo Switch to their name that at some point their (NVIDIA'S) market dominance must erode.
Myself and others have for so long bought NVIDIA cards with brand loyalty, but I think we should now step away and vote with our wallets and leave the "Apple" of GPU makers behind and see if we can reduce the Jensen retirement fund a bit...