Maintaining Rosetta 2 costs money and manpower as it continuously needs to be integrated in macOS and likely updated! Otherwise Rosetta would still have been around for much longer; like Classic the last versions simply didn't work under the next version of MacOSX due to broken frameworks etc as Apple diverted resources allocated to them to move on to newer things.
So are things at Apple, if history is any indication; that said it's up to the goodwill of some volunteer users to maintain backwards compatibility for as long as possible as was done in the past for so many features, eg macOS9 helper, XpostFacto, all the @dosdude patches, OSX patcher, Pike firmware, OCLP, 10.6 ppc etc! So maybe some good souls could be kind enough to maintain rosetta and link the correct frameworks i the macOS versions following its abandon, however it's source is entirely closed as it was bought from IBM as PowerLX86 who in turn bought it as QuickTransit...
Apple’s recent push into gaming may keep Rosetta 2 around a bit longer. The game porting kit is basically a front end for WINE, and they contributed a lot of code to the WINE project, most of which depends on Rosetta 2 to properly run.