If that be the case, I could see just walking away...
Am not totally dismissive of the idea, but if someone stands op (on the show) and says, "Yes, Jack, this is Atlantis..." that would be patently absurd, and I do not believe they will go that route.
Now it being said that the Isle through time led to what is the mythology that is Atlantis...(not as stinky as Brie, but still a bit of the curdled milk sense about it)....the disappearing city that whom was it, Aristotle? that wrote the history of it...? No it was Plato, regardless there are other mythologies that are far more interesting that could be tapped, and I rather see them creating new and tapping many to tie the knot of these old things together...