I don't know what you mean by this. You mean the dive sites and parking will be full, or that the health of the reefs will suffer?I'm not at all convinced the diving can handle a huge increase in divers; at least not the shore diving.
If the former, my observation is that most sites are empty, with no divers at them. Even the really popular sites (Salt Pier, HH) might have 4-6 groups there, but there's room for more. If the latter, I tend to agree, but doubt the generally declining reef health is due principally to divers.