I hate to be pessimistic, but I can't see any way that something like this is commercially viable. The costs and logistics are prohibitive. I'm not sure it's even possible to have something like this combining divers and actual healthy reef organisms in a closed system. Even this biggest closed system is a drop in the bucket compared to the oceans. Costs aside, just disposing of the saltwater waste produced by the very frequent water exchanges needed is a logistical nightmare. And, don't let anyone tell you that there's not need for massive water exchange.
Even w/ the best filters in the world, the accumulation of toxins introduced by divers, the end-results of biological filtration, toxins producted by various marine organisms, etc, will quickly overwhelm the dillution capabilities of even the largest aquarium. The level of water-quality required to maintain healthy corals, is very high. I just don't see how it could be maintained. *Some* large public aquariums are able to do it, but they don't have lines of divers constantly in and out of the water. There's a big difference between the water quality required to keep fish and that required to keep healthy corals. Even many public aquariums can't keep healthy corals and instead simply replace corals that have died w/ new specimens. That's a dispicable practice IMO. Corals are hardy and can often live 6-9 months in bad conditions, but the entire time they are slowly dieing and eventually give up the ghost. Keeping a coral for 6 months is NOT an indication of a healthy environment.
I'm not even going to get into the costs of maintaining something like that. Electricity for pumps, heaters, chillers, lighting, etc. Then there's the specialized feeding requirements for many reef inhabitants.
Nice concept, but IMHO completely unrealistic.
My $.02