Honestly if LEGO did a mythology theme, I would go broke.
That night.
Not even kidding. I absolutely adore Greek and Roman mythology. There's just a plethora of heroes, monsters, gods, goddesses, etc that could be fleshed, er, fig'd out.
Not only that, but the architecture of that time period was just fascinating. Arenas, altars, temples, AHHH. Everything was so awesome. Atlantis realllllly tickled my mythology bone with its sunken ruins that were very reminiscent of Greek architecture. Even more when LEGO released its Roman soldiers, Captains, Emperors, and traditional fantasy monsters like the Minotaur, Cyclops and Medusa.
To be honest, I can't really understand why LEGO -hasn't- done something like this yet. Children are taught enough about this kind of mythology in school (at least I was), and LEGO could even be somewhat educational with a theme like this. I imagine everyone had at least one favorite god or goddess from some pantheon, or at the least enjoyed some of the fabled stories or epics.
I really hope the naysayers are wrong in this regard. I would thoroughly enjoy a Mthyology theme. It would immediately become my most favorite LEGO theme of all time.
Unless of course, LEGO took another shot at Avatar: The Last Airbender sets. The initial offerings (only TWO sets!) were made before the show took off (back when they thought the series would do only one season), and was competing against Spongebob (insanely dominant at the time) for a spot for a full line.
I want my Toph and Azula minifigs!