I believe that the turning point for Witness culture was in 1980, when the Bethel purges began after the Disfellowshiping of Ray Franz.
Much like the advice given to King Rehoboam in 1 Kings 14 ... a rod of iron began to pelt the backs of the Brotherhood, seeking to stamp out any form of disloyalty. This (as most here will remember) took to form of hard-line WT articles on apostasy, increasing the oversight by the COs, a ban on independent bible study groups and an direct instruction to stop elders from arranging social gatherings.
Not that there was problems actually, but the fear to loosing control was enough to remove any form of locally organized activities and recreation, which directly contributed to the splintering of the collective spirit congregations generally bring.
And while it has take some time, its now quite clear that the very thing Governing Body didn't want back then ... has now quietly but fully been manifested in the form of lip service by the rank and file, with Publishers doing basically whatever they want.