Rosetta will go away. Game support won't.
"Starting with computers using macOS 28, Rosetta functionality will be available only for certain older, unmaintained games that rely on Intel-based frameworks."https://support.apple.com/en-us/102527
Do they plan to have a whitelist of games? I guess they could remove rosetta support for most Cocoa frameworks while keeping OpenGL translation layer.
I would assume people would switch to using FEX which is tuned for game performance for the x86 emulation bit.