They'll never do it. All the games in Super Mario All-Stars (and SMAS+SMW) are already on the Virtual Console, and playable on the GBA, therefore the DS (if you import Famicom Mini SMB2J). If SMAS were released on the Virtual Console, I imagine it'd be pretty expensive... compared to other VC games, that is.
Chupperson is right about SMB's physics in SMAS. It's not just different, it's all wrong. Still playable, and I love the music and graphics, but wrong physics.