I stand by what I wrote before the AI finale last spring: There is no show, in the history of the medium, that carries a network like American Idol does Fox.
Look at Fox's ratings for this fall. They're horrible, a distant fourth. Take away the NFL, and they're worse than the WB or CW or whatever the hell that network is called now.
In May, Fox will be first among the 18-34 demo, and probably second in total viewers, because the same damn thing happened last year. (Yeah, 24 will help the ratings, but not even a fraction as much.)
I have great interest in this show, even though I rarely watch it. For me, seeing the ratings impact and the other networks wave the white flag on Tuesdays and Wednesdays is more fun than watching the show itself.