I think it depends on how Watchtower will DEFINE what a JW is in the future....and how much they will use a "Theocratic strategy" to lie about membership numbers and activities. The "SPIN".
Are we talking about the number of ACTIVE publishers getting a few hours of REAL service EVERY month? Active literate publishers with the internet, who know enough JW doctrine to answer questions prior to baptism? Watchtower IS seeing most growth in third-world places without internet access, with low literacy, and with little understanding of JW doctrine.
Will Watchtower start counting members like the Catholic Church does...attendees for major holidays, weddings, baptisms, etc. (Humans DO like to socialize and have a "tribe")?
If a group of people who can't read or understand JW dogma/literature, arrange a dozen benches under a big tree, and everyone "partakes" and takes turns talking...is that a NEW JW Congregation? :) ...it is all about who does the counting...is it not?
A number of Adventist groups are gone. The Shakers are gone. Most Christian Scientists are gone. Quakers were BIG at one time. Most of the Russelites are gone.
Most literate Americans and Europeans are becoming less religious. https://www.theguardian.com/us-news/2023/jan/22/us-churches-closing-religion-covid-christianity
https://en.wikipedia.org/wiki/Category:Former_Christian_denominations
I think that as long as there are assets to sell, and sheep to fleece, Watchtower will continue to exist in some form, if simply to insure a comfortable retirement for the elite. It will simply look different.