Adam will be alright. He's already a professional performer for one thing. Secondly, he has developed quite a following because of Idol not to mention the people who already knew who he was from Broadway, The Zodiac Show, etc. And....we have seen TIME AND TIME AGAIN that you don't have to win Idol to become a huge success.
On another note, I just bought Kris's version of "Heartless" on iTunes. FIRE!!!! Best 99 cents I have spent in a while.