Not wanting to get too off-topic, but I would have preferred it if Micheal had simply banished Fredo. Then in GFIII, Fredo would come in right at the end. He would arrive at the opera house, hanging around for the end of the show in a bid to get Micheal's forgiveness. He sees Micheal and family walking down the steps. Then he sees the assassin draw his gun. In a final act of filial loyalty, he takes the bullet intended for his brother. Vincent shoots the assassin, and Micheal holds his dying brother's head.

FREDO: "Forgive me... Mikey..."

MICHEAL: "I forgive you... brother..."

Fredo dies.