They dropped rosetta 1, what makes you think they will keep supporting this one?
https:/www.wikipedia.org/wiki/QuickTransit
If you have to pay the licensing fee again every time you want to release a new version of the OS, you've got a fiscal incentive to sunset Rosetta early.
Rosetta 2 was developed in-house.
Apple owns it, so there is no fiscal reason to sunset it early.
Except not having to pay to maintain it.
Silicon (or verification thereof) isn't free.