JW's wait for the end of the world, while ex-Jw's wait for the end of the JW.s. Both of which are not going to happen.
The two are not comparable. The end of the world is not a regular occurrence, whereas religious communities often experience collapse and/or steep decline: Shakers, Methodists in England, Catholic Apostolic Church, Christian Scientists, and the Worldwide Church of God, are some of the more dramatic examples. (Declines probably between 80 and 100% in less than 100 years) Significant declines also impact churches in the UK such as the Christadelphians, Anglicans, Church of Scotland, Salvation Army and more. (Declines probably between 50 and 80% in less than 100 years)
There are many indications that JWs are on a well trodden path of decline, and in fact that their trajectory looks to be dramatic decline. This observation results from a large amount of evidence and reasonable comparisons with the experience of other churches.
In fact I would go further and argue that there are a number of factors that make JWs particularly vulnerable to collapse above and beyond what has affected other churches. Which other church has relied so heavily on publishing for its income? Which other church has such bad child protection policies? Which other church has such incredibly unbelievable overlapping teachings? Which other church is likely to be as stubborn to change views on LGBT equality? These distinctive features (not unique, but distinctive, and unique in combination and for a religion of this size) of JW religion do not bode well for its near to medium term future.