They already did on SNES.  SNES owners could also purchase the 2 games on that platform, and then there's Super Mario 64.  Considering Sunshine is still for sale, there are only 3 games that they would be able to add.  I doubt you'll see it.
On top of that, they also ported Super Mario Bros. and Lost Levels in Mario DX.  They have ported Super Mario Bros. 2 in Mario Advance.  They have ported Super Mario World in Mario Advance 2.  They ported Yoshi's Island in Mario Advance 3.
That being said, by using my Gamecube and GB Player, I am able to play all of the Mario series except Super Mario Bros. 3 and Super Mario 64.  Hardly enough to warrant a compilation if you ask me.