Well you kind've already have that to some extent on the Switch, with the
RetroArch LibNX Ports not all systems are fully supported yet, but a lot of work is being put into porting over cores, and making them as stable as possble for the end user, and some users are even adding their own flare in the way of Border Art for instance.
Personally, I'd love to see both PPSSPP ported, and eventually Dolphin as well, preferably at full speed with sound, that would make the Switch the definative portable emulation machine IMO.