While I think it would be nice (and appropriate, seeing as how Stitch is an animated character in a kiddie movie) if WDW made the attraction more child friendly, with a shorter height requirement, I don't think they'll be spending the really big bucks to rip out the old seating/harnesses, and all that entails, and putting in new ones so that smaller, younger children can experience the attraction. But maybe they'll just remove most of the harness, leaving a few sensors/parts still working in/on the seats? Kind of like the seating in the 3D attractions.