It will survive in some form, however based on what I see at the moment, the JW's are quickly becoming an african religion (not that there's anything wrong with that). The "faith" is getting more emotional, less "rational" to play to this. The competition between the pentecostal churches and the JW's is strong here. People have their foot in both camps, as they have the social aspect of the pentecostal churches.
Our CO at the last SAD gave this statistic - since 2007 in our circuit, 64 were baptized, 62 of them were from the African continent. 60% of the audience were african that english as a common tongue.