Carlo gambino saw the writing on the wall before he died, He knew that demographics were changing and that the real money was in Labor racketeering, construction and more sophisticated crimes. There was almost 2 families and the Bergin boys were hijackers, gamblers, loan sharks, and all around thugs. Gotti was a gangster who should have never risen above capo. Gravano the rat he was knew how to make serious coin, you just never would want him as your business partner.
I think that if Marino or Failla would have taken over the Gambinos would be thriving today. Gotti and his showboating as well as the public wacking of Castellano destroyed the Borgata.