You mean, what if the misinterpretation of what the Mayans said is right.

The Mayans only completed the calendar to the end of the era based on astrological position of the earth and sun. The current Mayan era ends tonight at the Mayan Midnight, not the world ends. The hint here is that the 21st, tomorrow, is the Solstice, which marks the start of their calendar year.

The Internet, blogosphere, and 24/7 news can be a dangerous thing.