I sincerely hope it just disintegrates over the next few decade. Unfortunately it'll likely create a few splinter groups and one will gather more followers than the others and find a scripture to use as "proof" that this little splinter is the real one and we start all over again.
You'd think one of them would realize the situation and at least try to make something of it. Like "Jehovah wants us to all tithe £20 a month and to fix this world - fight poverty, build schools and hospitals, support AIDS sufferers, help cancer research, build parks etc etc" £20 x 8 million = £160 tax free EVERY MONTH. Do that every month and you got a great world changing machine. At least then if you didn't agree with their doctrine you couldn't fault their world changing approach.