We all know people who are so deluded still that they willingly choose WTBTS as a charity whenever the opportunity arises, through Amazon or whatever. I certainly do.
Even if they lose any or all charitable status, they can just play the persecution card as they quietly shift over to a for-profit religious corporation, and then come out with new light to support it. They can and have done what it took to gain ground and survive this long -- with the precedent of Rutherford losing 75% of Bible Students as he made changes of his own -- and I don't think they'll just give up now.
Mind viruses will continue to evolve. The antidote to that will always be education.