Any port that has concerns over this could sever their connections with DPW tomorrow if it wanted to. All of those "ownership rights" would vanish in an instant, though the port authority in question would probably end up buying out the lease.
"Probably" here should read "certainly." And considering that the buy-out (which would actually be an anticipatory breach) would entail confiscation of billions in infrastructure and income-generating service rights, I doubt seriously that any of the affected port authorities would be able to afford it, even if they did decide to unilaterally take on the federal government's abrogated duty to protect the homeland.