Its as real as the Chris Christie hype from 2013. Doesn't mean it won't last untill 2024 but we've seen many prospective presidential candidates get hyped up only to sputter out before Iowa.
So as long as he doesn't close down any bridges, he's good. I really think Christie would have easily gotten the nomination and won the White House if not for Bridgegate.
Bridgegate started the decline but he made so many political mistakes during his second term as governor that I'm not sure he'd have gotten the nomination anyway.