The worst Major team would not be able to drop down unless they were below 9 roster points if they would be able to drop down at all. That would be up to the committee.
It is possible to put a bad major team together. That isn't the committees fault and a team like that doesn't just get to reclass down and trash a lower division. The situation talked about in this thread is a bad major team intentionally putting a bad major team together but playing AA and possibly being allowed to do that.
All just my personal opinion which means nothing.