Well, I was just noticing it in the Disney kids since Miley came from that group. Britney Spears, Lindsay Lohan, Miley. There are others to that didn't get as far because of their antics.
Justin Timberlake is doing more than okay, he is one of the biggest stars today.
About the kids that are doing okay ( Miranda Cosgrove, Ariana Grande. Victoria Justice. etc)
I think they do okay because they don't have to prove anything to anyone or themselves. They don't want to be edgy and they are okay with their Disney fame I guess. (And their parents cared for them too)
Selena Gomez is doing okay too I guess....
Jonas Brothers are doing okay too, (But they did say a lot of crap about Disney and how it used them)