I don't think any of those things matter; Apple will stop supporting Rosetta 2 as quickly as they can. They announced the transition to Apple Silicon will be two years and unless something unforeseen happens, that's what it's going to be.
I suspect that Rosetta 2 won't be available for new Apple Silicon Macs running macOS five years from now.
Of course, no matter how many years in advance Apple warns that a particular technology is going to be deprecated, that never stops people from complaining vociferously when it happens.
A great example is 32-bit apps, where Apple gave something like an 8-year heads-up that 32-bit apps were going away, which happened a few years ago but it's not hard to find threads on HN where people are still complaining about it.
