I guess then the question would be; assume they got rid of the sea lions dolphins etc... could Miami SeaQuarium survive with just flamingos and aquaria?
From what I see, the Seaquarium seems to have comparable prices to other aquariums... but if public reviews are to be believed, which I will admit they are not always, then it's a bit less for the same price. An general ticket to the Seaquarium costs, at time of writing, $35 at gate [$33 online]. It costs slightly more for the Clearwater Aquarium, though for the Gulf World Marine Park [which does not appear to segregate based on prices] it costs $25.
Though I will say this also... I do think with Lolita they had something of a 'little monopoly' - in that, aside from Canada, the only other orcas kept in American aquaria would be those at SeaWorld, which of course costs quite a bit more [minimum $67.99] to go to as it operates as a brand, a theme park. So in lieu of getting a ticket to Canada and paying standard theme park fare, Lolita was the 'cheapest' orca in America to visit; which I suppose for some justified the price. Now without Lolita I feel there is somewhat less justification as the price remains the same. And certainly if the dolphins and maybe sealions left there would not be very much justification for the price at all.