Military blogger Murdoc disagrees and I'm inclined to think that he is right. His most powerful argument:
The problem with the 92,000 number is that it's nothing more than the total size of a partial list. For instance, it contains zero US Marines.
So, we'll see what really happens. Iraq doesn't seem to be getting much more docile, elections notwithstanding, so I don't have high hopes for a withdrawal in the absence of strong, bipartisan Congressional pressure.