Actually, it did end. Early this morning. And we all died. But we were asleep. And we did not realize we died. So we "woke up", and continued living our daily lives not realizing we're in a self-created limbo world.
There's still time for it to end. See, since it was the Mayan calendar, it should go by Mayan time, right? So I pinpointed where they lived and found out the time there. Right now, it's about 4.16PM on the 21st. In my research, I also discovered that you get the whole of the 21st day, so it ends at midnight for them.