Doubting Bro,
But the people who stayed away from the book study already were at the fringes, already had low morale. They were likely the ones that were "low hour publishers", certainly they were not pioneers, elders, or MS.
That was usually a minority of the congregation though. CBS attendance, while low, is still generally at least 70-80% of publishers.
The ones who did attend, now have their "social hour" removed. The one meeting per week that was more relaxed, is gone forever. No more goody nights, no more CBS groups hosting the visiting Sunday speaker, no more hanging around after the CBS just talking...now all meetings are in the stuffy, formal atmosphere of the Kingdom Hall. Those are the ones who are going to feel deflated.