Could Cheryl Cole return?
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Music cred: Though she certainly can't rack up album sales the way she used to (few on this list can), Crow is nevertheless a nine-time Grammy winner and has sold an estimated 35 million albums worldwide.
Why she would be good: Crow is a sunny, engaging presence who remains a well-liked stalwart of the music industry. She also looks remarkably good for her age (she turns 50 next month) and doesn't have the plastic, unnatural appearance of so many other aging women in Hollywood.
Why she could suck: There's the chance Crow's warm persona could translate into the singer being too nice for her own good.
Chances: Even odds. Though Simon Cowell may well be looking for a younger singer to rope in the kids, there's no questioning Crow's substantial musical legacy and name value. - Chris Eggertsen