For those of you that think the WT will be around forever... will eventually produce a situation they cannot control, and that will force their demise, or at least force them to take on a likeness that no one would recognize as JW.
Hate to be a wet blanket, but I think the WT will be around for a very long time. As you say, religions evolve and adapt to changing circumstances, and the WT will be no different. They're being more stubborn than some, and I doubt they'll "thrive" in the information age, but there will always be people who want and/or need religion, and so there will always be religions to give people what they want and/or need.
I think your last sentence is key--they won't be recognizable as what we've known as JWs, but the current WT would be barely recognizable to those who first joined in the late 1800s. What modern religion would be recognizable to those who were there in its formative years?
I wouldn't even be shocked if they adopted the Trinity, holidays... all of it. The only thing they really need to do to survive is to quietly drop all the Millennial stuff; become just another Christian group that's waiting for the Second Coming, without the hints that it's months-not-years away, and they'll survive.