I definitely disagree, Plaw. Fredo's anger at the patriarchal (sp??) figure in his life is strong. He resented Vito, and then Michael, for running his life, although we are shown frequent examples of how incapable he is of running it himself (the Moe Greene meeting, Deanna, his slip-up in Cuba). Like many weak men, he is jealous of the power and strength of those he depends on, but doesn't want to put in the work to achieve it. His anger and resentment towards Michael would only grow. As a matter of fact, since he would literally be beholden to Michael for his life, it might even grow exponentially.

IMHO, Fredo showed NO remorse for his act. When Michael tried to explain how he became the Don because that's what Vito wanted, Fredo exploded. That's a very dangerous man for someone in Michael's position to have around.