> Except, as far as I'm aware, the Jones Act hasn't prevented the collapse of the merchant marine fleet--in other words, it's failed to do its primary goal, and it has some pretty heft costs for everyone who doesn't live in mainland US.

Then instead of repeal it, fix it. I wonder if the flaw is that it didn't account for the changes in American sea traffic as foreign imports have undoubtedly increased by orders of magnitude since it was passed 100 years ago.