I think it is different this time. A lot of developers use Rosetta 2 for Linux to run x86-64 Linux Docker containers under macOS (including me). They'll be upset if Apple discontinues Rosetta 2 for Linux. By contrast, once the PPC-to-Intel transition was under way, Rosetta was only used for running old software, and as time went by that software became increasingly outdated and use of it declined. While I think Rosetta 2 for macOS usage will likely decline over time too, I think Rosetta 2 for Linux usage is going to be much more stable and Apple will likely maintain it for a lot longer. Maybe if we eventually see a gradual migration of data centres from x86-64 to ARM, Rosetta 2 for Linux usage might begin to also decline, and then Apple may actually kill it. But, if such a migration happens, it is going to take a decade or more for us to get there.

The first Rosetta was based on licensed technology, used at a time when Apple was still pinching pennies.

It made financial sense to stop paying the licensing fee to include it in each new version of the OS as quickly as possible.

There is no financial incentive to remove the current version of Rosetta, since it was developed in-house.