I'm not ready to write of long time commercial success for any of these three quite yet.
Scotty may be the perfect storm in terms of name recognition (resulting from "Idol"), talent, niche, and commercial appeal for the country music genre. And he's only what, 16?, for God's sake.
I could see Lauren achieving Carrie Underwood level success, which is nothing to sneeze at.
I might very well buy a Haley album or at least download a few cuts when it comes out.