I don't know about Phila. specifically. But speaking broadly:

Selwyn Raab, in the conclusion of his outstanding book, "The Five Families," noted that once law enforcement learned how to use RICO effectively, Mob bosses tumbled like bowling pins; and squealers, frighened by double-digit RICO sentences, underminded the rest. Prosecuters fought each other to prosecute Mob guys because nothing succeeds like success. But since 9/11, he notes, much of the total law enforcement resource that had been aimed at organized crime has been diverted to anti-terrorism work, leaving the field more open to the Mob.

My conclusion: as long as people want to gamble, do drugs, visit prostitutes, buy hot goods, cut corners, etc., there are always going to be organized crime gangs willing to satisfy their needs. But with respect to the Mafia: the caliber of people recruited in Phila. and everywhere else had been at or near rock-bottom for years. So, the future of the Phila. Mob (and others) rests on leadership--a doubtful proposition these days.