The problem with 2012 claims is that they are either testable or so vague as to even evade a definition.

Testable issues: poleshifts and new planets etc.

Vague issues are like a consciousness shift or paradigm shift or dimensional shift or whatever people want to call it. There is an old joke about sending in 3 religious leaders and asking them to come out with an answer. When they exit the meeting they present 8 different answers. These vague notions about 2012 are of the same ilk. Every person has multiple and often unrelated answers as to what is meant.

The question boils down to, "How do you know this suggested idea came to fruition?" How does anyone know what to expect when it can't even be defined?