It's not just about winning in the NFL, it's about competing in the local entertainment market. Florida has 3 NFL teams. Not too mention the Falcons to the north. By the time you throw in college football, night clubs, watersports, Disney and all of the other attractions, it's no wonder why the stadium is empty. Winning would remedy a lot of the problem. But having iconic players and coaches, playoff appearances and championships would really make it easier. But I believe the "band wagon" label will always exist.
In order to create the devoted and die hard fans that bleed you team's colors, you need environments that offer little entertainment competition for the average fan's disposable income. Take for example, the University of Kentucky Wildcat basketball fans. With the exception of a metro Louisville, this entire state bleeds Blue. Why? We have no pro teams to call our own and there's nothing to compete with Rupp Arena during the basketball season. Rupp Arena holds nearly 25,000 people. Year and year out UK is always #1 or #2 in national attendance average (Syracuse). And even the cup cake games get over 20,000 people to attend.
If you look around the NFL, you wouldn't be surprised to understand why LA fails to host an NFL team. NFL teams need grassroots fans. That's hard to cultivate in towns where the NFL team isn't the icon or major attraction. I wouldn't be surprised if the vast majority of people attending Dolphin games live an hour or more away from Miami. And I wouldn't be shocked to find out that most of the people attending have seen less than 10 games in person in their life.
What the Dolphins really need is a Howard Schnellenberger type figure that can galvanize the town and build a true local fan base. I think I saw a post a little while ago talking about how little interest the Dolphins have shown in Hurricane players. And all local Florida college players for that matter. This is part of the same problem. If you want locals to watch the games, give them names they've been supporting since they were kids or for at least the last 3 or 4 years. You don't have to draft all Florida players, but seeing how well other teams have done with USF, UCF, FSU, UM and FU players (just to mention a few), I would say we could have done a lot worse.
Why was Don Shula and Dan Marino so hard to replace?
You weren't just replacing a coach and a QB. You were replacing icons and living legends. Both had been with the organization for a very long time. Which is one of those sticky problems with the modern Free Agency period in the NFL.
One of just many that have eroded this team's fan base.