I think this is a major point for me. You can't expect these consoles to last forever or stay at an affordable price. There are consoles like N64 that has a variety of issues with emulation, and I think you need to split the leaderboards in those cases. Some games also have unique problems with emulation that might mean certain emulators need to be banned. In most cases it isn't really an issue though for older consoles.
I think this is a major point for me. You can't expect these consoles to last forever or stay at an affordable price. There are consoles like N64 that has a variety of issues with emulation, and I think you need to split the leaderboards in those cases. Some games also have unique problems with emulation that might mean certain emulators need to be banned. In most cases it isn't really an issue though for older consoles.
Not unless they're making new hardware...