No.
The biggest crisis was the 1914 fail, followed by Russell's death. 75% left. Rutherford resurrected from the ashes the religion branded with his own unique style.
If 75% left now, they would still have 2 million followers with billions of dollars in equity. The next charismatic figurehead would have the perfect springboard to launch the religion from, put his own stamp upon, and if he desired a huge cash resource to live off.
in 2015 Watchtower spent 1/4 billion looking after missionaries and special pioneers. The current Governing Body are winding back this unnecessary waste of money, unnecessary branches and printing expenses, so that the religion can operate within its means. After shedding all that dead weight, anyone with decent leadership skills could take over and set up for great luxury for decades to come.