For all the fanfare that attended Thursday’s announcement of an agreement among the main players in the Vikings stadium saga, the plan as presented begged as many critical questions as it answered.

Despite the best efforts of advocates for a new Minnesota Vikings stadium, a series of deadlines to advance a bill for a new professional football stadium have been undone by a steady stream of delays.

The implied threat driving the Minnesota Vikings stadium debate is the possibility that the team will quit the state. But national analysts of public-private stadium financing deals are skeptical about the proposition that leaving town would make financial sense for team owner Zygi Wilf.