I belive the watchtower will fall.
Maybe not now but in ten or twenty years its really going to be struggling.
It will be obvious to most in a few more years thay armageddon is not coming , 1914 is wrong etc."Apostate Knowledge" will become much more widespread due to the internet.
It is different to other religions in the fact that everyone is looking forward to armageddon in their life time. It is the driving force for witnesses and will cause it to die.Armaggedons no-show will cause bitter disappointment .
Those who have left already , and have taken their families with them have stunted future groth as this is mostly made up of children of believers .
People are becoming better educated and more knowledgeable in general.
All the elderly ones will have died, with no link to the past ,and no armaggedon enthusiasm will die out.
This generation of witnesses may be the last.
(Then I woke up)Or did i?