What old school mafiosi could have reached the same heights as Michael Corleone’s success? I say Gambino or Costello. Michael was a billionaire in the movie or at least close to it and he moved on to legitimize almost all of his businesses. I think he achieved what many of the old timers dreamed of achieving themselves. Either that or they dreamed of seeing their kids take their fortune and turn it into an even bigger empire(much like Michael did with his family’s fortune).