I don't see why a discussion is even necessary. 1) Emulators are fine. 2) Copyrighted material (ROMs): Only copyright holders can give you permission to use it. That's the law. So, ROMs are not fine. 3) Keep 1), remove 2) (if any) from the repositories.
This ofcourse means the emulator developer needs to find a web host for the roms, which will then take the legal risk. Indeed, the people in this thread who think roms should stay, would probably make the best candidates as hosters