I mean, it could be a good kid-friendly ride, sorta IASW-esque. No danger, just a relaxing ride. No height requirement. Then you have Yoshi, which has no height requirement. Then you have Mario Kart, which is kid friendly. Then you have all of the play areas and meet and greets, which would make for one hell of a kids area with plenty of stuff for all ages. And if they really wanted to they could have DK replace ET (although most would hate that). It's not the greatest idea in the world, but it's not really a bad one either.