Carrie is a superstar, but you don't need superstar status to be successful. All you have to do is be able to earn a living doing what you love, and I think this show gives contestants (if they have anything going for them at all) the opportunity to pursue.
I would buy a CD from either one of these two, depending of course on what direction they get steered in. I've loved others on Idol only to hate what they produced on their CD. So we'll just have to wait and see.