It is more about long-term sustainability than anything else, but...
1. Negative legal pressure and bad PR is hurting them.
2. Money is a problem. The 25 year old "donation" arrangement is very long in the tooth, and beginning to show real signs of stress. JWs are not big donators to begin with, (most don't have much money to give), and those that do have the means are smarter than to give away money they see has no purposeful use.
3. The are rapidly becoming irrelevant in a better informed society.
They will be around for a while, but I am, (almost), convinced a real corner has been turned. The WTS does not like to appear to capitulate easily, and it is clearly appearing to be very desperate.
d4g