I don't think he's coming back, maybe ever, but certainly not in the next 5-6 years.
The club won't admit their mistake by giving him more control, Max won't come back under the same circumstances. They had the perfect opportunity now and they chose a rookie over him.
I read his book this week - he dedicated a whole chapter to how Italy needs to change, needs to give managers more power in the decision making of the whole club, not just transfers. I think he wants to test himself in England and/or Spain.