M1 and M2 hardware isn't going anywhere. They're still great machines. And progress will be faster once the project finishes getting their code merged into the existing Linux kernel and distros. They have a first alpha of M3 ready, they're just refraining from releasing it in that state because they're so busy with everything else they're doing - a key difference compared to when they first came out with alpha support for the M1.

I’m sad because the WiFi on my M1 MBA is dying/dead and there’s no way to replace it without swapping the whole “logic board.” Apple also doesn’t support any USB WiFi adapters in recent versions of MacOS, so it’s now tethered to a wired network connection. I’m just waiting for the M5 refresh to hit at this point. Anyway, all that’s to say that at least some M1 hardware is going to to the trash heap soon :(

To add to that, they'll continue to be great machines running Linux even after Apple has bloated MacOS to death. Tahoe has made my M1 MBP feel significantly less snappy for no good reason.