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.