If this were to be ported, It would definately need these features:
-Powerups
-RF Multiplayer
-AI
-Falling off ledge kills you insted of teleporting to top of screen.
-Many more tiles, more backgrounds.
-breaking blocks to kill people like in the Mario Games(the blocks would ofcourse respawn.
-a slider that changes the marios colors that uses RGB (you could change skin, overalls and undershirt)
-eventually a simplified system thats like Supersmash brothers with punch kick and special moves!
-classic Mario sounds and music.
Wow thats alot.