User blog comment:Mlgrsd/I'm sure Michael stays forever in the Cage./@comment-1975828-20161203024317

The crew said a couple of times that they might not do anything about Adam Milligan, which means Michael won't return either. For all I know, those two are as good as gone.

However, I'd personally like Michael to return, not as a villain, but as the brother Lucifer always wanted. It's not fair only Sam and Dean get to be all lovey dovey and protective while other siblings fail.