Switch is doing better than anyone expected, a huge success and still going strong, will reach easily 150 million.
PS5 is not doing bad, better than the ps3 but worse than the ps2 and ps4. But of course its only due to shortages
Xbox series is doing better than the one, but worse than ps4 or ps5, then again if you count out the series S which is much less powerful than the other 2 next gen, then the xbox would be doing bad, but again, shortages don't help.
If its true that the semiconductor shortages will go until 2024, then this will be the worst generation in terms of sales, and consequently games as developers will prefer to do cross generation as to not lose money.