And in Obama's case, that turned out to be extremely premature. So learn from history? Then again didn't Time give this award to Hitler, too? So yeah, they don't exactly have a good record of learning from history.
Hitler was MOTY in 1938. Since he had a rather large effect on history, it seems as if they made a good call. Remember, this is not supposed to be an honor, it's supposed to identify someone who influences things.