Jeremiah: The only hope for new converts is in third world countries without ready access to the internet. However, without new converts in advanced countries, the money will dry up.
Unless, of course, the WTBS gets government aid for all their wonderful work in language revitalization and translation and such...you know...for literacy programs and all that. JWs who are in third world and developing countries will apply for government aid to fund their 'literacy' programs (it is already happening in Africa).
New converts will happen in developed countries as well. Maybe slower, but they will be there. Besides, the JWs with money will continue to 'contribute' to ensure that the WTS teaches the congregants in the 'correct' way to live their lives (and die)...the way that will profit the wealthy JWs.