Woltz, your question about the Dons' meeting, etc. is a good one. Of course, if Michael doesn't murder Sollozzo, the whole story arc changes. However, more questions: does Michael go back to college; does Vito then have the time to groom Michael for leadership; does Sonny succeed Vito; does Tom remain as Consigliere; what happens to the drug trade; do the Barzinis eclipse the Corleones; do further attempts by Sollozzo to murder Vito succeed; how does all of the foregoing alter the organized crime structure in NY; and most importantly, does Fredo ever learn the casino business?