You Could Play NDS games on Wii, but how about Wii on 3DS?
You Could Play PS1 Games on New 3DS/2DS (XL), and N64 on every (New) 3DS/2DS (XL), but does the New 3DS have enough power to run the dolphin emulator?
Of Course, We could have a options menu saying if you want the Wii Remote to be...