re: If Sonny Corleone doesn't get whacked, does the Corleone family win the war?

Sonny was too much of a hot head. Sonny would wind up whacked anyway. After all of the shite he stirred Tom could have had him whacked or Michael.

We never see if Vito was cold blooded enough to do something like that. Remember Vito survives and then retires. Vito would have just taken back over. Sonny was a hot head but not ambitious. Not enough to fight his own dad for control. A fight he would lose.