I think it could be expected for the organisation to go pear-shaped.
One significant factor must be the present GB are inheritors of a system and mindset which had been built on a timescale based on the 1914 generation. How can they be God's agents on Earth when they always get their predictions wrong? Even doomsday cults need some plausible evidence for their authority. The present incumbents cannot point to anything they have done which would demonstrate divine intervention.
WT style religion is being replaced by a more modern approach which does not require an "organised" hierarchy. A private spirituality without a need for preaching satisfies many today.