Sadly, I don't think Ke$ha, Miley, Katy or Chris will last another 10 years.
Here is where some people will be in 10 years:
Leona will be regulated to touring in small European cafe's.
Katy Perry will become a television actress -- playing the young mother on a moderately successful ABC comedy.
Justin Bieber will leave the spotlight within those 10 years and return after he's beyond legal age to sex up his image. Like his mentor Usher did. He will become successful.
Chris Brown will never be as mainstream as he was, but contiunous urban support will help him for a while until he leaves altogether and focuses on mixtapes.
Justin Timberlake will be regulated to featuring artist -- singing choruses, while still focusing on acting.
Ke$ha will be irrelevant once the Dr. Luke fad wears off, she grows older and has to drop the trashy image.
Beyonce's career will remain highly successful, but a child will interfere with her career.
Bless his soul...