Ferry to where ?
Few ferrys make any economic sense these days. The number of people to go from Dunkirk to PG on any given day that would be willing to pay money rather than driving an extra 25 minutes is going to be tiny.
A ferrry from somewhere in SOMD to the eastern shore I would have use for. There was a study of the proposal for a private ferry sometime in the late 90s and some local politico is proud to have shot it down. Traffic since has gotten worse, could be worth looking at again.
I have taken ferrys in NC, from New London,CT to Long Island and from Cape May to Lewes,DE. In all cases, it would have been cheaper to drive, but rather than sitting in traffic, I was drinking coffee on the passenger deck. I suspect there would be some commercial traffic willing to use a ferry to carry goods to and from the eaatern shore.