If Massino had said no to Gotti about the Commission reinstatement, then who knows how things would have ended up.

The Bonanno's don't need to be on a Commission to be successful and with things nowadays without a Commission its still very bad.

The only way for the 5 families to be how they were would be to kill everyone that exists in American LCN and start all over again. That way there would be no rats or even the knowledge of past rats, like Valachi and Massino.