Well first off my wife made me watch it and reacted the way you did to the news. I have a theory, even though I don't watch.
So normally, from what I have seen, alot of the successful contestants have a POP/RNB sound when it comes to their style. With the exceptions of that one Blues guy and the Gospel guy. Overall though most of the winners could easily be seen making a mainstream POP music album. This Adam guys was a breathe of fresh air! Had that 80's hair band twist to almost everything he sang. Now when he was in a crowd he stood out, because all the Pop music fans were split between their perspective favorites, but once it was one on one it became a genre war. Rock vs Pop, and lets be honest the fan base for American Idol isn't exactly a Rocker's hall of fame. So in the end the teeny girls won the day. It's inevitable.
Either way though, the winner and the successful artists are rarely the same people so I am sure you will get your fill of Adam soon enough :).