Sadly, looking at the Paul Grundy chart provided by Anony Mous the conclusion is that the WT got away with it.
There was a slight decrease in publishers after 1975; but basically they were able to keep the majority of new converts since 1970 (700,000) and the number has kept growing up the actual 7-8 mils.
They are laughing all the way to the bank.
Who cares about 1975?