ECW has probably taken a hit due to some of the political/social issues flying around in the US right now. Your question is actually a very interesting one, but I wonder if it's also a nigh-unanswerable one.
In my city if I were to base things on what I see, I'd say X-Wing and Blood Bowl are the top two miniature games being played. I sometimes see 40k and WarmaHordes getting played as well. If it were based on what I see people buying, that would probably be X-Wing, 40k and more recently Age of Sigmar.
I flit from game to game, range to range quite a bit. Or at least I did. In the past year I've really zeroed back into superhero gaming, largely thanks to the release of the Batman printed rules and Pulp City 2nd edition. The Terminator game release also was high on my list, which I've purchased but not yet played. We still play a lot of Strange Aeons, largely due to my proximity to Uncle Mike's secret lab.