Certainly those old timers are still there...They are going nowhere now, except the grave, which they always believed they would never see. Of the 1970's intake? I certainly know a few that have skipped, perhaps the 1975 debacle had something to do with it.
I do not know too many newer ones, what with moving area then dropping it myself. One thing, there are precious few new ones coming along in the cong my wife attends. It seems that youngsters growing up make the new publishers.
How long before they are told to procreate as a "Sacred Service"?