Our decisions are always shaped, in some way, by what is described as a hierarchy of values (I'm not sure if I have the term right). I do agree that a ruling body is granted power by the consent or agreement of those who are governed.
(I also don't think it's anywhere near that simple, but for the general example, it will do.)
For an organization like the WTS, which demands unquestioning acceptance of the GB as the spirit-directed leadership of the rank-and-file on Earth, it's not unusual to see the kind of turnover they do; people who do ask questions will inevitably agree to suppress those thoughts, will leave, or will be removed. But for many, there are other considerations at play.
I know that my mother must feel some mixture of confusion and disappointment that the end hasn't yet arrived, after more than 55 years of expecting it to happen "soon." But she gave up a lot in order to remain a JW, and now she is in her mid-80s and those dreams she had are long since gone. And the only thing she has left is that promise of eternal life on Earth and a chance to finally live the life she thought she would already be living by now. It is the ultimate sunk cost. To give up now is to accept that she wasted her life, and I don't think she can face that.