Probably best not to look too much at 2012 prophecies for the truth I hate to say. There is very little actual science around what might or might not
happen when we pass through the galactic equator.
Given that it has happened many times before I doubt it is the end of times as some people say though.
That doesn't rule out a cataclysmic geological event
I definitely think something occurs at the end of their Long Count cycle. What that thing is I don't know, and neither do the people
who came up with all these prophecies and theories.