Wait a minute! Turnbull “Michael takes Kay and Mary to the opera house--all of them sitting in an open box, together” because Vincent, guaranteed their safety

Barzini and the other Dons, in a sense, have already won the war? at least got the upper hand? – There was no retaliation from Vito after Sonny's murder which “weakened the Corleones and devastated Vito”

I am not sure whether “Michael’s survival actually was a lucky break for the Dons” as if Michael had died in the car bomb, I believe Vito becomes irrelevant, a non-entity

My take, for what it is worth!

• Vito with both his Don material [bad and good Dons] sons dead, would probably have handed over what was left of the Corleones to Clemenza and Tessio
• As regards “Vito’s police/political protection” with Vito out of the 'business' the judges and the politicians now in Barzini's pocket
• Barzini and the other Dons “get into drugs here and now”
• money rolling in! for Barzini, the other Dons, the judges and the politicians
• Barzini becomes the Numero Uno Mafia Don
• Vito dies a broken man