"Hope deferred makes the heart sick..." (Prov 13:12)
Generation after generation of JWs have had their hopes dashed, experiencing failed predictions for the years 1914, 1925, early 1940s, 1975, and by 2000.
Add to that the constant harping by the WTS on what is 'just around the corner' by repeatedly using certain 'buzz' words, and it eventually wears people out.
-- ...soon the earth will be a physical paradise.
-- Christ will soon bring grand blessings to all obedient mankind on a paradise ear.
-- ...we are at the threshold of the new world...
-- What a shame it would be to lose out on the new world when we are now at its threshold!
-- ...we face the imminent end of the present world system.
-- In view of the imminent approach of the battle of Armageddon...
-- With Armageddon rapidly approaching...
-- Jesus will serve as God's Executioner during the rapidly approaching "great tribulation.
-- execution of judgment at the battle of Armageddon must follow very shortly.
-- ...God's kingdom is now established in the heavens and will shortly usher in a new world of righteousness.
Jehovah's Witnesses the most disappointed people on earth. They have grown sick of hearing such things, even if they are not consciously aware of it.