Yeah, I have family and have been vacationing on that barrier island just South of Palm Beach for the better part of my life. Some of my earliest memories there were my dad showing me the remnants of A1A that had been washed out by the 1947 Ft. Lauderdale hurricane. I feel like a storm like this could move enough sand and destroy enough buildings to move it again.
The other thing besides susceptibility to surge is just how ridiculously expensive many of the properties are. Driving up or down A1A is just an endless display of money. Here's a sample stretch I picked out from Zillow.
Looks like that 1947 storm took a very similar track through the Bahamas with no last second turn to save the coast. Of course it was much weaker than Dorian.