While I regret to admit it, despite the plethora of scandals which have rocked the JW world and have been publicized such as the masking of pedophilia (silentlambs and appearances on Dateline and Panorama, the exposing of Ted Jaracz for the corrupt, arrogant asshole he is), the blood doctrine issue (Shunned Father in Canada making headlines), the UN affiliation (plastered all over the Internet), etc.. The JW-organization WILL go on.. for now.
If the Watchtower Society sticks to their current doctrine and practices, they will most likely lose the vast majority of members as the diehard older ones kick the bucket and new recruits dont sign on (harder to convince the cynical, educated Internet generation now isn't it you WT lurker fucks?) costing them revenue and the ability to grow. This is already evident in the zero growth rate seen over the past decade or so in many developed countries (and this is according to the WT's own yearbooks and literature, which we all know are doctored and heavily altered by publishers to increase numbers which are not there)
If they decide to change policies drastically and go mainstream, this would probably demonstrate to the majority of the loyal members that it is not the true religion, but a publishing company seeking profit. Why would new members join up after learning their history?
Either way, they WILL LOSE numbers, as they already have.
Alas, I do not foresee their TOTAL elimination just yet. After all, the Catholics survived the Holy Crusades, which slaughtered MILLIONS in the name of God.