Mourinho is done for sure, no going back. He is an absolete coach now going purely on ego and damage control. His football is reaching outdated status ala Capello football was.
Cant say I wont enjoy seeing him go down, because he has been a destructive and obnoxious character far too long, as BAus man said, Mourinho is done since Real Madrid. And he ruined it purely on his own ego. He made it all about himself, petty excuses and creating hostile toxic sitautions to distract instead of focus on football (I laughed at how Italy treated him, ceremoniously rejected his circus ridden tactics as a whole collective). Clasicos are watchable since he left, compared to the insane WWE level pathetic shit show of hate it used to be. He tried the same shit in Chelsea and it failed 2nd season. Now he is trying the same excuses, undercutting his own players bs, and it makes no sense, until you realize its all about distracting you from how mundane and mediocre his football coaching is.
He really has no tactics anymore, not that his core tactical from beginning was special anways, safe conservative football with some counters. But football has since long figured him out and passed him by.