Joe Profaci because for his greed his family was hit by two internal wars with gallo crew;
Carmine Persico because refused to step down and the third colombo war the family between killing and rats lost half of his made men and now even if half recovered is the weakest NY family;
Carlos Marcello because refused to made new members and his crime family died after his dead;

For the whole Gotti’s era or Scarfo reign of terror, the families are still here and for te bufalinos I doubt that D'Elia had find many mobsters that want to be made in the 1990s that was the worst years for the mob.
The reasons why the big mob families stay in the east coast is because there are still large recruitment pool and mobsters with have the Brain or the ball for run big rackets. In the other part are just criminals with an italian surname.