Blackwell is 5nm and Ada was 5nm as well.
Entire 4N node is 5nm optimized.
This is why you see power consumption go up with 5000 series. It would not be possible for Nvidia to increase performance much, at same powerdraw. 5090 will be like 33% bigger than 4090 die-size wise. Because, no shrink will happen.
At TSMC, major nodes are 7, 5, 3 - Everything in between is just optimizations, which mostly affects efficiency!
Market did not really reject the 4080 at 1200 dollars. It sold much better than 7900XTX at 900-1000 dollars. The real reason 4080 sold "bad" (In Nvidia terms) was because 4090 was only 400 dollars more and vastly better.
AMD is not competing in high-end, so yes, Nvidia can price Blackwell pretty much how they want, when sales slow down, refresh with SUPER!
AMD radeon 8000 series will barely be able to compete with RTX 5060 series.