It wouldn't be the same game if they removed it and put the Voltorb Flip in. I can't imagine how hard it would be to program that into the older games. Maybe it wouldn't be that hard but the thing is more that they will cop a lot of backlash for not having the games as true to the originals, you know? Remakes are a different story, but this is literally supposed to be the games we grew up on + a few cool new features.
It is an interesting thought though, and one that I definitely had first up!