Interesting question. There is so many things that were left unanswered....that's not a criticism but it would have been interesting to see if he was really done with Cuba and also what happened to the Corleone crime family after 1959-60. Also what exactly became of the Rosato Brothers. We know they were on the run BUT knowing how ruthless Mike was its hard to imagine they would stay alive
...and: who took over the NY operation after Pentangeli turned?