I think he can bring back rock into the pop arena. Get rid of the rap crap that currently dominates.
Top 40 Mainstream then? According to Allaccess.com, currently in the top 40 there’s 2 Kelly Clarkson, 1 Daughtry, and David Cook at 48. In terms of Rock in Mainstream Top 40, there’s some rock there, no doubt - Shinedown is at 5, AAR is at 9, Nickelback at 26, Offspring at 31, Plain White T’s at 32.
There’s really no shortage of rock on Top 40 Mainstream. Now, I’m not saying this is good stuff. But you ain’t getting good stuff from American Idol.