What happened with Buffalo and Detroit is you have a situation in which all the bosses and most of the members were older and rich, and therefore don't really have much of an incentive to commit crimes. So they both have about 20 made guys left, but they aren't doing much of anything.

IMHO, this same process is affecting the Chicago Outfit at the moment. The membership is getting too old and too rich to have any reason to actively engage in high-risk crimes. They aren't as far gone as Detroit and Buffalo, but they are fading like that.

I think that New England and Philadelphia are being more eroded by law enforcement pressure than they are by the "old rich guys fading away into retirement" phenomenon that took out Detroit and Buffalo, and (again, just my opinion) is currently killing off the Chicago Outfit. Especially Philly, which seems to have an unlimited supply of young Italian-American guys willing to fill up the ranks (New England is being affected by the aging thing a bit).