The whole world should skip a day and go right from the 20th to the 22nd of December. Therefore, there will be no 21st of December... and therefore no Mayan doom date.
I think this is a reasonable solution. Think about it this way... in the spring we adjust our clocks and move time ahead one hour. So why not move time ahead one full day and thus save the world from the Mayan December 21st DOOM fest?

So, adjust your calendars at midnight tomorrow and switch to the 22nd of December and outsmart the ancient Mayans and their end of the world doom date.

What sayeth thee GLP?
Is this not a brilliant saveth the world idea? Hmmm?