I guess I've just seen so many announcements of their imminent demise for 16+ years (and I know it didn't start then) that I'm skeptical. There's always someone new who is quick to declare that they will destroy the WTS and if only we can get the message out then people will be convinced and leave. The walls will crumble, people will cheer, the clouds will part and rainbows will blaze overhead.
It never happens and I don't think it ever will.
They have always been a fringe religion of changing beliefs and evolving doctrines and while some people will leave over some of them, many forget that they change for a reason - either to retain or gain new converts. They appeal to a particular niche and as long as life isn't too bad for people they will grow up and stay in long enough to often saddle a new generation with the life. It's no different to any other religion - you are brought up to believe what your parents believe until you realize your parents were wrong.
Some people take all this to mean "OMG, Simon supports the WTS!" but of course it doesn't mean that at all. I am just being pragmatic and realistic and have heard it all before.
The crisis and the doctrines change but the song remains the same.
It's also worth remembering that they fill a niche and if they disappear, that niche wouldn't - someone else would fill it with some other variation to appeal to the customers who want to buy that type of religion. Would removing the WTS overnight be the best thing for most people? Possibly not - it would probably lead to some suicides and lots of vulnerable people. A slow decline into obsolescence is the best thing IMO but most importantly right now is the support so those who do want to leave can leave successfully.