MIAMI — It is halftime in the NFL, nine weeks in and nine still to go in the regular season. It is a time when fans across the league take stock and recalibrate expectations for their team. In Miami, the midpoint reckoning takes the form of a question: Dare you dream, Dolfans? How big? How high? Tua Tagovailoa, asked about the growing hype around his Dolphins, said, “We’re not afraid to talk about Super Bowls around here.” It was a revelation. This franchise’s mediocrity and irrelevance during most of the past two-plus decades have rendered the conversation moot. Now, you have the quarterback …