I don't know much about the detroit mob but i don't really buy the whole related by marriage or blood stuff, what they gonna do, keep reproducing gangster kids in the suburbs or what ever high class area they live in. They might still be around but just in loose groups doing loansharking and gambling or the leadership got old and there probably was not enough members to sustain a hierarchy and guys justs split off from it or walked away.
That's pretty much what happened. There are still about 15 or so made guys around, but they are almost all old, rich, and content with that. Same with Buffalo.
