I believe this to be true, by quitting you activate brain cells in some JWs who are curious. Sometimes they know something is wrong on a subconscious level but they don't/won't think about it until they see that others also recognize the problem. A few have told me personally that they left and I had an indirect role in doing so. I was DFd and it was widely known the reason why (apostasy).
Sitting in the hall for years on end when you don't believe it only helps perpetuate the lie.