If I were a believing Witness I would answer that in 1985 they had around 2.8 million publishers . Today it is well over 8 million.... Enough said.
Even during the cessation of the field ministry they still managed a small increase.
Of course I am not a believing Witness any more so I will qualify that by saying that figures don’t show everything.... but there are still a large number of believers prepared to preach and report each month. Much as we would like it to, the old WTS ain’t going away any time soon