Have you ever known someone to form an exploratory committed who isn't running? I have always laughed at the whole "exploratory committee" ruse that politicians play.
Fuck an exploratory committee, if Fauxcahontas wants to run let her run. I think she would be the candidate that would give Trump the hardest time. I sure hope the democrats don't nominate her.
Announcing an exploratory committee gets free media attention and it is a legal thing for campaign finance laws. If a candidate does it early they are hoping it may cause others not to announce.