With the closure of the luxurious Revel casino and nearby Showboat last week, as well as the bankruptcy and anticipated closings of the two Trump Entertainment casinos, Atlantic City’s future -- and the state’s role in it -- is very much in doubt. Gov. Chris Christie made a big bet on its revival a few years ago, making equity investments in properties and taking over the policing of the downtown casino area. Now that some of the high-profile investments have soured . . .