(http://i781.photobucket.com/albums/yy91/KentaUzumaki/KentaBG-2.png)
I think somthing Big Might Just happen.
Examples such as... Huge Bomb set off in USA or different states. Or something like Zombies xD
(http://i781.photobucket.com/albums/yy91/KentaUzumaki/KentadownBG-2.png)
It was announced at one point that the whole 2012 thing was simply something to get people excited about the movie and whatnot. I don't think it's gona end personally. Though i wouldn't be surprised if it did sooner or later. We're doing a good job at destroying it.
Another theory said was that the Mians simply couldn't predict any further. I mean common now they predicted thousands of years in the future they had to call it quits at one point or another.