The suppliers moving is one thing. Us losing the many species that are perfectly abundant from florida is another.
I can't imagine how long it'd take to recoup live rock when most of the live rock supplier got it from there or aqua cultured it. That'd set the hobby itself back quite a few years if there becomes a shortage before the gulf gets more attention from georgia and texas, and funneling it all in the gulf is equally concerning as we'll deplete it even faster and the slippery slope of regulations stopping gulf collecting, invasive species, etc.
That being said I don't see any concern rn besides fear of the slippery slope this won't be well managed, looks to me its mostly double downing on the restricted species rather than banning aquariums. Holy thursday massacre AFAIK (last I kept up with it was when they released the body cam footage) wasn't even a violation of the regulations, it was a miss-identification followed by lack of communication and completely off procedures for if the scenario was even correct for them, they didn't even do it right or humanely. The main concern in relation to that is them potentially killing your dog because it looks like a dog face pufferfish, cause they did miss-ID the snakes and they were legally kept as well (hopefully that's still true, again I only pay attention to it for about a week.)