Here's why I disagree with this comment, and a lot of the opinions of this board (though you all rock like a ham hock in your own way, don't go changing...to try to please me...don't change the color of your hair...)
The problem of replacing Aerosmith with any popular act, be they a legendary act or a flavor of the month - heck, the problem of using Aerosmith in the first place - is that you risk the ride seeming obsolete if the act either drops in popularity, breaks up, a member gets caught "in flagrante delecto" :lookaroun it's a problem waiting to happen. I understand why Aerosmith seemed like a logical choice, and why a lot of people lean towards another legendary act, but honestly, why must it be an actual act?
The ride's in Disney's Hollywood Stories, for crying out loud. I think it'd be great to create an original story, complete with opening movie, about either a young band who are offered a big break if they can get to the gig RIGHT NOW (hence the rush that comes from the coaster) or an aging fictional act (in two words: Spinal Tap, tell me THAT preshow film wouldn't be hilarious, and I'll call you a damned liar) getting a last-minute opportunity to fill-in for a supergroup that got held up flying into Los Angeles. If it's a young band, heck, it could be a band played by the Jonas Brothers or Miley Cyrus, just not playing themselves. Let them be goofy, like that susprisingly funny Backstreet Boys video that "homaged" the documentary Heavy Metal Parking Lot. S***w worrying about the best popular act, or worrying about a flash-in-the-pan artist automatically dating the attraction before it has a chance to reopen. Get Spinal Tap, or make up an original act, and make the attraction "a movie starring YOU" as you're with the band trying to get to the gig of a lifetime. Change the audio of the ride to include dialogue from the band as they speed through traffic narrowly averting danger and cops. Make it funny. Make it fun.