I think that what they're saying is that Windows 11 would be like Windows 8 or Windows Vista - short-term and forgotten - and there would be Windows 12 that would be reasonably better than Windows 11. Heck, most devs that still support Windows 7 doesn't actively test against Windows 8(.1), so I wouldn't be shocked if Windows 12 exists in 2025 Windows 11 would be treated the same way.
ah, the good-ol 'Every other release is the good one' MSFT that we came to know and love!
Maybe we'll get Windows 11 Second Edition?
Yes. Microsoft's EOL dates are never actually enforced, and two years isn't long enough for all of our "unsupported" hardware to be lifecycled.
I can't see it ever becoming more expensive to stay on Win10 before everything unsupported is replaced.