Seeing as he is the only person on the street who knows what phelan is capable of, I imagine he will see Phelan do something and Phelan will kill him to keep quiet.
I'm not going to complain anyway, because I've hated Moany Michael ever since he first appeared. And his marriage to Gail was too cringey. His constant appeal for sympathy from Gail in the early days of their relationship really annoyed me.