They're basically already been released in HD on the Playstation 3. They just happen to be on Blu-Ray video disc so they can also be used on non PS3 Blu-Ray players, although I doubt many non PS3 owners have taken advantage of it.
With the Blu-Rays out, I have no interest in a compressed SD release on the Wii. If they had stuffed Dragon's Lair 3D on there, I might've been tempted (Been looking for the GameCube release for a while but never see it).