G Movies are stupid anyways, the only way you can dumb a movie down THAT much is if there is no real story line, conflicts, etc.... You might as well watch 6 year old cartoons.
When it comes to movie's, they are trying to get people into a theater. Why take your infant child to a movie if there is absolutely nothing that can entertain you? Disney movies have always done it spot on where the kid is entertained, and the story is good enough for adults - with the occasional pun that only the adults will get. If you target just the kids, goodluck getting parents to come out and pay $15 each for something they are going to fall asleep during.