Had things turned differently,I think Mike would have settled down with Kay, raised a family,and pursued a very successful career in business,(perhaps Wall Street),or even in politics.

According to some articles I've seen,Mike expressed an interest in politics,even in childhood,and,wondered if there would ever be an Italian President.

The path he chose,(and some may argue,the one that he was forced into),while noble, in the sense of protecting the Corleones, turned out to be the great tragedy of his life.

He lost everything, his brothers,his wives,his children,and eventually,his beloved daughter,gave the Corleone Family business to Vincent, and died broken and alone.

Nothing in life is sadder than wasted talent.