It was just a question of whether it'd be that or some hot-shot taking the fence out that happened first.
Clearly this beach is a major tourist attraction, precisely because you can get close enough for a good sand-blasting. Personally, I can't think of a single good reason to choose SXM over any other Caribbean destination besides Maho Beach. I would be very surprised if this led to barbed wire out into the bay and closing the beach and the road, for that reason. Do that and I wouldn't be surprised if cruise ships stop coming - and that fence won't get blasted nearly as often either.
But the previous faceplant should perhaps have been a clue that all the signs and policemen telling you not to surf the fence don't work, and that concrete blocks in that location were not the brightest idea. This was entirely foreseeable. Reducing the number of things to hit in the blast zone to an absolute minimum, so that people come out with enough road-rash to teach them a lesson and not worse, really should have been done already.
I don't know whether it's possible to have a blast fence that's frangible enough to sit inside the security fence and still stand up to a 747 at full thrust... but again, if it reduces the attraction, and you weigh that against a single fatality, is it even worth it?
I expect instead that the police will be on this like white on rice for a while, and people will be hanging off the fence again before the month is out - concrete blocks or no concrete blocks.
Let him that hath understanding count the number of the beast:
For it is the number of a man; and its number is One hundred threescore and twelve.