I understand the OP asking why the Dolphins have to move just because they can't compete to host a Superbowl. That's the dream of every owner to host one, second to winning one. My question is this.
Not even looking into the numbers, would it be more cost effective to renovate the stadium or move to another city and build a new stadium? I would think renovating our current stadium, even paying 100% of it, would be easier and more cost effective.