BS. Two reasons behind my thoughts:
1. The end of a Mayan calender simply means a new beginning or something new, not the end of the world, that would have been labeled

.
2. Cortes and the Spaniards invaded the Mayans and pretty much wiped them all out so how would they have possibly continued their calenders? There isn't any possible way for the Mayans to finish their calenders if they are all dead.
M3RK