Sure. I've been thinking the same idea recently as well. But let's ditch the only Mother 3 idea for once, alright? How do all three games in the franchises in an all-in-one bundle sound?
Unfortunately, that's thinking in a highly idealistic and romanticized mind set. Of all the franchises, why does the one every fan is clamoring for have to be plagued by copyright issues? Well, that's life for you.