Where I live here in California, the group that "oppostate" describes fits the vast majority of JWs that I know. His description is absolutely spot-on. Personally, I call them social Jehovah's Witnesses. I call them this because the majority of their family and social circle are JWs, so they go along with the program because that's all they know.
They were brought up "in the truth", yet are not as fervent or studious as their parents. They love getting dressed up for conventions, taking selfies or group shots with their friends, and then posting to Instagram. They love, love handing out tracts or babysitting a literature cart. A lot of them go to college, get degrees, and have decent jobs. They meet up for happy hours, go clubbing, and openly talk about the latest R-rated movie.
However, If you ask a social JW what the current understanding is of the Biblical generation, or how and why they believe 1914 was the end of the Gentile Times, you will just get a blank look of confusion. They also have private doubts about the whole Armageddon thing, because they know deep down that Jesus won't really come to Earth and slaughter children because their parents didn't take them to meetings on Thursday nights.
As long as the WTS doesn't make their lives too difficult or annoying, social JW's have no reason to change. Any private reservations they have can easily be quashed and glossed over.