Basically, I think it's probably too small for the dolphins, let alone the Killer Whale. That said, I think the question of whether the Killer Whale should be moved is an entirely separate issue given how long she has been there.
I personally think that Lolita is symbolic of how NOT to maintain a large marine mammal but it seems as if her fate is to exist in her tiny tank until she dies and I suppose that at this point that seems both reasonable and sad at the same time. Here is a fairly recent article documenting Lolita and her long life at Miami Seaquarium:
The tank is defenetly is Tiny for Lolita and she has to be moved to a new place or a seapan where she will live her remaining life in peace but as we can see that will not happen scince the activist are trying to relocate her but still no luck.We heard a rumor that Miami Seaquarium is being sold to the same owner as Marineland France but no news yet,that is just a rumor so far. Hope we see Lolita in a new big and improved tank soon