Keep in mind that most of those Wii U's and Wii's definitely did not have Mario 64 actually purchased on it, as well as the fact that you can no longer purchase the game for those systems. With the price an N64 and the cartridge go for these days, playing the original hardware is considered a premium.

I'd consider the DS version to be its own game. I love it, but with such large changes to the core gameplay it's certainly not a port, and it's not a remaster. Personally I think Nintendo should just release widescreen versions of both to the Switch, maybe with Mario 64 DS being an overhaul DLC.