The problem is, the Jones Act has harmed our shipbuilding capacity as well. According to the artcle our ship building capacity is 1% of China's and US built ships cost 6-8 times as much. That's not helpful.
So better have ship building capacity at 0% of China's and it be impossible to buy US built ships at any cost?
In a vacuum, the Jones Act should be encouraging the construction of new shipyards and/or freight rail infrastructure. That neither seems to have happened suggests that other barriers exist, and those barriers need addressed, Jones Act or no.