Here's something I didn't know: season 1's order is only 12 episodes. Don't know if they'll get a back nine for the rest of the season or if 12 episodes is it. Also, don't know how many episodes next season will be. If it's just 12, they're following the cable formula now for dramatic series.
http://www.hitfix.com/the-fien-print/american-idol-will-end-after-season-15 I got roped into watching this a lot because my wife loved the show, but she gave up on it a few seasons back. 15 years is PLENTY of time for a show like this.