I'd rather have Aerosmith than some lame Disney group. It's quite simple. The Disney Imagineers wanted to do something different with Rock 'n' Roller Coaster. They asked Aerosmith if they wanted to be part of it. And at the time of the ride's development, Aerosmith was very popular.
I Don't Want to Miss a Thing by Aerosmith is from Armageddon produced by Touchstone Pictures presents (among others) Jerry Bruckheimer Films, distributed by Buena Vista Productions - sounds like enough Disney connections to me.
A lot of things have Disney connections, doesn't necessarily make them relevant to a particular Disney park. Though I do understand your point. But I think it's still a stretch to have a huge ride dedicated to Aerosmith, and again this is just my opinion.
An besides, that song was cheesy, that movie was ridiculous, and all of it marked the beginning of Aerosmith completely selling out. Hahahaha!
(that single, Steven Tyler and Joe Perry doing a GAP commercial, and the band playing with nsync at the SuperBowl halftime show were 1-2-3 strikes!)
I would just like to point out that the Tyrannosaurus Rex, from the Cretaceous period, totally doesn't belong anywhere called "Jurassic" whatever....
Sometimes, you need to just suspend disbelief and meet them halfway. They needed an E ticket ride in DHS. People like roller-coasters. I got nothing either. For good or ill, it could have been Bon Jovi, though....
The ride is at the end of Sunset Blvd. The real Sunset Blvd is home to several clubs where some big rock bands in the 80s frequently played before they got big, particularly at Whiskey-A-Go-Go. It's a terrible fit because the time period makes no sense, but there you go.