I agree that the top end gpus are shit at efficiency and we should could cut back.
According to Steam survey, 4090, 3090, 6900XT, and 7900 XTX combined are being used by about 1.7% of gamers.
This number is, of course, inflated (at least slightly) because people who have money to buy these cards are also more likely to buy games and people owning older/cheaper cards are more likely to be playing pirated copies.
The top tier cards are showcase of technological advancement. They are not really used by a large number of people. So there’s not much point. It will only reduce the baseline for next generation, leading to less advancement.