If Scientology can survive, how will the WTS not do so?
The appeal to disaffected folks in society will be the same if not stronger in the future, I think. The WT religion has had 100+ years of refining their recruiting techniques and their controlling practices.
But they know they need to change with the times. So far they've been quite adept at changing doctrine to fit their needs.
The JW,org flashy enticement is a way to reach out to the next generation, the tech savvy, smart-phone-in-hand crowd.
The older generation is passing away (and so is it's desires of living forever in a paradise earth without having to die). The WT is moving on and leaving these folks behind.
My feeling is it will definitely be (and already shows signs to be) a different WT religion--more techy, more flashy, less demanding of Bible knowledge and more loyal to the hierarchy.