Most witnesses would probably not follow the FDS. Why ?
Well, it was often compared to the blood issue. But there is a difference: With blood, the information given to Witnesses is mostly taylored so they believe, there is always an alternative to a blood transfusion, and that this alternative method is always better anyway.
So obeying not to get blood, is not really endangering the life, but its even beneficial health-wise.
Once I heard from a brother on the HLC, that there are situations, when only blood can save life, it was for me part of the awakening.
I think, in western world, where even people with low education, have at least some education and critical thinking,most JW would not follow blindly in order to become suicidal. Of course, a few percentage of crazy ones are to be found anywhere, also among JW (maybe a little bit more then elsewhere)
Additionally this is highly fictional anyway, since the WTS is like any corporation, it tries to survive. A situation like jim Jones would kill it off, literally, they would never do that.
Rather I see in a few decades JW becoming more and more mainstream, maybe before that they tighten up, and then with a newer generation and more people they become more like Cathlics or any other religion....