Actually this has nothing, at least for now, to do with the stadium.
Miami-Dade County Mayor Carlos Alvarez and Miami Mayor Manny Diaz will hold a press conference Tuesday morning to discuss the future of the Port of Miami tunnel project, which had its state support pulled last week.
The tunnel is a major part of the so-called megaplan, touted by the city of Miami and Miami-Dade County as a $3 billion raft of public improvement projects that also included a new Marlins stadium and refinancing for the Adrienne Arsht Center for the Performing Arts.
(emphasis is mine, except for the performing arts center.)
The proposed stadium doesn't require state support, so this shouldn't be a problem. That is unless the city of Miami and Miami-Dade view the tunnel as more important than the stadium when vote time comes around. And even then, I don't think scrapping the stadium will give them enough money to build the tunnel on their own. However it is never a positive thing when the state government opts out of a project since it may give some of the local commissioners an excuse to do the same.
The tunnel being scrapped probably won't affect whether the stadium is built or not. At least I hope it doesn't.