My point is: look at Caribbean islands like Antigua, Barbados, Dominica... even if they lose their beaches due to seaweed invasion, they are still nice countries to travel around... For example, during my stay in Antigua I spent maybe a couple of hours on the beach, but I spent a few days driving on a rental car all around the island, visiting everything. Never saw any garbage around, everything was really clean, as it should be.
If DR will lose their beaches because of the seaweed invasion, there's nothing else to see there. The whole country is a big garbage dump. Who wants to drive to so-called national parks or any eco–tourism places in DR, if you have a risk that some neanderthals will throw big rocks to your windshield on the highway, because if you crash, they can steal your wallet and your shoes? Who wants to see mountains of garbage here and there on both sides on any highway? Who want to see tons of floating garbage in the rivers?
So if seaweed will ruin DR beaches, that's it. There's nothing else for tourists here. I think that Government has to think about it before it's too late. The whole country can be cleaned, everything can be repaired, rules and laws enforced, it there will be any political will to do that. Unfortunately, in DR they need another Trujillo for that.