Theologically, I agree, but I'm not sure what would cause the followers to actually question current teachings. Usually, followers of a movement don't question

Theologically, I agree, but I'm not sure what would cause the followers to actually question current teachings. Usually, followers of a movement don't question the path taken until they lose confidence for some reason (like Democrats recently discovered). When it comes to religion, such losses of confidence seem to usually be on the personal level, so a large scale reckoning seems unlikely.