If they ever do make it, it should be for the Gamecube. SMAS2 would have 8 games rather than 4 on SMAS1. Those games would be: Super Mario World, Yoshi's Island (SMW2),
Super Mario RPG, Super Mario Kart, Super Mario 64, Super Smash Brothers, Paper Mario,
and SSBM or Super Mario Sunshine.
I personally would prefer SSBM over SMS.
The master of multiplayer Mario games: You''re looking at him right now!