What makes you think they will collapse?
Hope, and observation of the society thinning everything out and stagnating and being shown for what they are to millions of young people online (the antigay cartoon made it to 9gag) and begging for money on JW Broadcast.
Also, this very year, they've made promises that they cannot take back about the great tribulation. Those bunker videos at the worst convention ever weren't for nothing. It wasn't just a delusional man talking at the podium. It was a lot more visual than that, and it didn't just stay at the convention. All of it went online for the whole world to see. If I wanted to, I could repeatedly upload that footage to sites like 9gag just to keep it in young people's mind.
The organization is incestuous as it is at this point, as the vast majority of current JWs and new baptisms are born in. But as they talk to their friends, all the other kids have to do is Google it. They've peaked.
What's more, I'm actually worried.
At some point, witnesses have to retire. Pensions all over the world and social security in the USA included are not secure. Although the details and politics are debated and disputed, in only a few decades, social security will be insolvent. Millions of people are in for a massive reality check.
I agree, things are changing. If not a collapse, call it a decline, but it's a recipe for transformation, reformation, or schism.
Or indeed, maybe I'll just wake up.