Happened before, will happen again.
RAM was this price some years back, and yet last summer/fall it was at an all-time low.
Competition.
Will we continue to see steady improvement in top quality CPU/GPUs? Would they even bother releasing consumer versions of ram faster than DDR5?
The current generation is insanely fast. I am planning to get a gaming PC for my wife and a mix of gaming + workstation PC for me (or maybe just base it off of the Ryzen 9950x3D and call it a way). We plan to hold on to them for 10 years.
I don't care if anything 6x faster comes out. For what I need the current generation is even an overkill.
I'd even go as far as to say that it would be quite OK if that's the very last generation and no further hardware development ever happens.