While we are a traditional franchise with a storied history, no club is unmovable. Just to put things into perspective for you, Woolrich had a soccer team at one time, they located near the Arsenal, named themselves Arsenal, then couldn't resist the urge to snuggle up to north London and be next to Tottenham … yeah, teams move.
It's much the same in the NFL. Sure, there are rules, like you can't move unless you put in a request with the owners and they approve the move … but it's a business, and they don't really stop people. Take the Arsenal owner, Stan Kroenke, he was a rich guy, born and raised in St. Louis, who married an even richer lady, then started buying up a bunch of sports teams in Denver Colorado. His crown jewel was his hometown St. Louis Rams. According to the rules, he wasn't allowed to leave St. Louis without a formal request and a showing of economic hardship or something similar to that. Despite being offered a sweetheart deal on a new stadium, which easily eliminated any economic hardship, he started building a new stadium himself in Los Angeles. Despite him having no real legal stance to move, he built the stadium, potentially offering the NFL a lucrative new stadium solution in a prized LA market, so they skipped the whole rules thing, screwed over the Oakland Raiders, and let Kroenke rip the lucrative St. Louis Rams out of St. Louis to return to a more lucrative LA stadium he was building. Because …. well …. money tends to win.
Yep, that's the same guy who owns that wandering team from Woolrich.
The Dolphins are owned by an incredibly rich guy in Ross--he donated the single largest donation ever to a school and they renamed the Michigan Business School after him. He's old. Eventually he's going to pass or sell the team, when he does, we are 100% at the whim of the next rich guy who comes along. Hopefully they don't get a better offer.