I am not sure what the effect of losing charity status would be, or even what that is supposed to mean. In Aust, each congregation is registered as an individual charity, and the overall organisation in Aust is also a registered charity. If all of them cease to be charities, then they probably have to register as companies, which would mean they would have to pay tax on income, produce proper accounts, and be potentially audited. Further, making donations to “worldwide preaching work” would probably be a misuse of funds.
Alternatively, if they don’t register, as a company, and operate as a collection of like minded individuals, then that creates all sorts of other problems. For example, what happens to Kingdom Hall ownership? I suppose they could set up some sort of discretionary trust arrangement, but where land ownership is involved, that has to be recorded, and they would probably have to pay more tax than if they were regular companies.
Further, I suspect that what they really mean by “losing charitable status” is that the various state governments may appoint an external administrator to each of the charities. That would be a true disaster for the borg in Aust. I doubt it would come to that, and there will be some negotiation before the borg ends up signing to the scheme.