While I would very much like to think that they had reached this "tipping point" , I have my doubts. Many have been predicting for over ten years that the "tipping point" (or similar) had been reached, but it hasn't yet.
It seems that this lot is are a bit like the cockroaches and rats that survive a nuclear explosion - whatever else happens, they still remain. (e.g. Britain's nuclear tests on Christmas Island in the 1950s).
Something I do notice, though: those that remain long term with the JWs tend to pay lip service to whatever the GB /WTS says, but quietly ignore the more extreme demands of their religion.
So perhaps a decline in extremism, rather than sudden death, is how it will progress from here?