I'm not sure if I understand the question, but would say that from a purely pragmatic standpoint, the pinnacle for the JW's occurred during the age of the "New World Society" during the 50's and 60's.
Part of this, I think, was the general optimism of the time period; part of it that JW doctrines were still plausible inasmuch as time had not yet run out and part of it was that life back then was different in ways that favored and facilitated groups like the JW's
Believe it or not, before cable, satellite and the internet, when you were lucky if you had more than three black and white channels on television, JW meetings were the high-point of people's weeks.