I'm not so enthusiastic.

Emulators can be used for more than just playing games. Consider debugging and reverse engineering; hacks, fan translations and homebrew software development; input recording and tool-assisted speedruns... I doubt an official emulator is going to support any of that.

More fundamentally, emulators act as executable documentation for the hardware, preserving it and its entire software library. Official emulators are likely to be closed-source, providing as little knowledge about the emulated system as possible.