I agree with this analysis.
I think she’ll sit this election out, but she’ll put everyone on notice that she will mount a 2016 primary challenge if the next GOP president doesn’t fly right.
That's about the most likely scenario, IMO, too. By some measures, she's a "kingmaker" in the GOP. As was shown in the 2010 election, landing her endorsement is a huge plus for a conservative candidate. Though she hasn't tipped her hand directly, it seems she relishes her current free-agent status. But we shall see.