Disney will never put U2 in RnR...simple as that. They have an image to uphold, and with the amount of talking and controversy started by statements made by U2, it just wouldn't fly with the Disney Brass.
I personally would think it was a huge slap in the face if they were to put U2 in that ride, because they have a perfect ride right now, and would be really stupid to change it.
I just think Aerosmith's music is more fun. I'm not saying I don't like U2, or that they don't have a sense of humor, or that they don't do a few upscale tunes. However, the ones mentioned, wouldn't work...plain and simple.....
Plus, I think Aerosmith appeals to a wider array of fans, and therefore is the better fit anyway.
This ride is great...why change it anyway?
Guess some people just aren't happy with things the way they are.....those will be the same people to complain when things do get changed. Go figure.