If they're unaltered, then they could fit it since Wii games are 4.4 GB, GameCube games are 1.2 GB, and N64 games are small. Wii U games are 25 GB. (50 if the disc is dual layer) I should mention that it's not actually everything, just the main games that came out. This doesn't include NSMB, since I feel Mario Maker would cover that.
If they were to improve the graphics to Wii U quality like the original SMAS, then it might still fit, especially since so many resources would be shared amongst the games. (Mario, Bowser, Peach, enemies)