Short term? Nothing at all, long term. It depends on how usable they are. Cause even if you make something with it, an emulator is gonna need to be able to read and use it. These emulators are shells based off the N64, but they're not quite the N64. As for an emulator using what's been made, various reasons leave it unlikely. What's there might not even teach emulator makers (or the people that could break into it) anything they wouldn't know about the N64. Also, all of this stuff is Nintendo's own tech and tools, that we got illegally, I had heard Nintendo emulation is even more legally black for emulation, because early n64 emulation was made using leaks from IBM.So with the news of the 64 dev tools being leaked, how could this effect emulation?
The N64 still has a lot of emulator compatibility issues with a lot of its games. A full accurate emulator could be great thing.