User blog comment:Mlgrsd/I'm sure Michael stays forever in the Cage./@comment-24695878-20161202220713

They mention him. Lucifer mentioned that he went insane inside the cage in The Devil In The Details. He was also mentioned in We Happy Few. God mentions that they are short three archangels and that he doesn't have enough time to resurrect Gabriel and Raphael. He then mentions that Michael is in no state for battle.

I would love to see Michael as a villain in the possible future. A villain who is insane would be fun to watch.