I agree with all of that, however imo, Disney is pushing it towards kids. Family Guy and Futurama are animated television shows. But are they for kids? No, not at all; they're pushed towards people like you and me. I just think that an 8 year-old would rather listen to Bieber than Passion Pit and Karen O. My two cents.
But an 8 year old isn't strictly who it's made for. Disney is one thing, Tim Burton is his own. It's for adults and kids in the way Nightmare Before Christmas is, where the "target audience" would probably be deemed kids and adults alike. It's not like, Cloudy with A Chance of Meatballs aka cheap potty kid humor or something.
Plus just the point of putting Beebz on it would actually take away some of the integrity that appeals to adults.
EDIT: PLUS the fact that a large audience are adults in their 20's because they were fans of the first Frankenweenie, er der.