Well, part of the problem with modern emulators is that more and more consoles are just relying on regular off the shelf hardware components. That means more of what makes them unique is in software, which is a problem, because emulating software is a lot harder to defend legally, especially in the US and Japan.

So, realistically, the sooner you see a Switch 2 emulator pop up, the faster it's likely to be taken down by Nintendo's lawyers.

Also, they're probably not going to screw up and leave in a hardware recovery mode that bypasses all their security again, which is a big part of why Yuzu could get started so fast.