All the thousand upon thousand preaching hours has resulted in the general public knowing the following:
1. I think Jehovah's Witnesses don't celebrate holidays? 2. I think they don't accept medical assistance? 3. They annoyingly come to your house in the early morning.
That is what this preaching of the good news has accomplished in the last hundred years.
The genearl public don't know about life in a paradise earth, 1000 year reign, resurrectuion of the dead on earth or even the fact that Gods name is Jehovah.
By their preaching success rate the end of the system of things won't come for another 1000 or so years.