I don't believe that the Watchtower will ever fold completely. Religions don't really ever die, and if they were to, oft times they are simply resurrected. The JWs are an offshoot of arianism and several other branches, so can one really argue that arianism died?
The difference between something like the collapse of communism and the Watchtower are different cases - communism was imposed in the later years and thus fell spectacularly. Socialism on the other hand is alive and well in Scandinavian countries where they vote for it and thus have the ability to change their minds.
While the JWs do horrible things to those who quit, only the children are forced to attend in reality. We see many children leaving, but many other adults going back in. People like the way they feel as a JW, and more power to them. I like the way I feel in spiritual matters. My only problem is the fact that my wife is a JW (which hurts our marriage) and that they try to impose their will on me through preaching.
Anyway, I don't think they'll ever disappear. It's a choice, and it's a group of people who are willing and able to change their minds without letting on to their population. I figure they'll either mainstream (as they have been doing for years, whether by trying to change the mainstream ideas (i.e. blood is bad, bloodless surgery good) or by simply giving up stupid notions like blood, etc.) or they'll collapse into a format more like the Bible Students. Good or bad? Neither, they just exist. Each person must make his own choice and worship his own god. Whether these gods are made up or not is another story.