I do believe we are at a point where most born-in's will leave and very few converts will join. While 7 or 8 million is a drop in the bucket with 7.3 billion people, it is massive enough to be self-sustaining for several decades.
Plus, we don't really know how many are leaving and certainly how many are leaving mentally, but staying officially "in" for family.
Personally, I think the money grabs of late are from an organization that sees a decline of membership and contributions in the future and wants to take the holdings now. People are already becoming secondary to money.
There must be some power behind the powers that wants to maintain WTS for a long time, so they must be using the money to buy goods or services from their own companies or those of their families. I suspect that these same powers have moved their people over to construction and building materials now. They have to build build build while the people are still there. Then they can sell sell sell when the people are gone.
It's almost wide open to view now. So I tend to agree with you. Most of what will be done now will piss off members and they will leave. But people in for a long time will only slowly cause a decline unless a huge event (scandal) gets them out.