One thing about Grand Cayman that is different from other islands. They "do not" need the cruise lines to keep their economy afloat. There aren't too many poor people on Grand Cayman.
It may go through but the people with the most money aren't the excursion operators and gift shop people. The hotels could care less and the banking industry (one of the largest in the world) really doesn't give a darn.
We'll see what happens. It's been "talked" about for a long time. So far all it has been is talk.