I some times ago noticed two forms of 2012 doomsdayers:
-Doomsdayers-physics
This type use 2012-theories based on (in most cases don't understanded or friengie physical theories) law of physic or on personal personal "vision" of physical laws.
Examples:
Patric Geryl.
Most form of Nibiru conspiracy theory.
-Doomsdayers-newager-spiritual
They are often use "channelings" and aliens. But in most cases this aliens are some form of spiritual. They are less interested in "technical" images of 2012.
Examples:
-Zeta Talk
-An Solara
In my personal opinion most of "physics" are males and "newagers" are females.
And with "physics" is easier to debate because they often acept science but have friengie view on it. Newagers often consider science as evil.