There is Bridgegate the legal reality. Class action lawsuits have already been filed. And state-level criminal investigators could wind up charging the players such as Bridget Kelly with crimes. Sure, the bunch could go off to jail.
Then there is Bridegate the media story. That, points out influential POLITICO, will go on as long as Chris Christie is considered a contender for the White House of 2016. If he announced that he isn't running and the media believe that the coverage of Bridgegate would implode. Here is that angle from POLITICO.