Amazon and Google show prices mostly from around $2300-$2700, more or less around $2500.
There's one in
Aliexpress for under $500, maybe this is the one you're talking about.
Yes, but DLSS3 requires a 4000 card. DLSS 2.3.4 is a fair comparision, works in a 2070 Super.
People thought they weren't going to be able to have 4K games on PS4 Pro, and achieved it with many games, in some cases doing checkerboard rendering.
People thought PS4 wasn't going to be able to perform VR decently, but they did that retroprojection thing to "double" the framerate. In PSVR2 they went beyond with stuff like foveated rendeding+eye tracking to optimize even more the performance.
People thought they weren't going to be able to put raytracing in PS5, or that PS5 was going to perform worse than Series X and performs better in many games (same with supposedly equivalent PC specs).
I suggest you to watch the iSize -the company that SIE just bought- demos, they use AI to reconstruct -and optionally scale it up- the image from streamed videos, achieving better quality even with lower bitrates. In real time, independently of the hardware and the codec with under 5ms of latency. The demos they had in their web were really impressive if real, and they mention can also be used for gaming. So pretty likely Sony could use their tech to make their own DLSS/FSR and maybe without even having to wait for PS6.