I believe there is still numerical growth, they seem to baptise around 8000 a week, whereas 1200 to 1400 a week leave. You have to remember that even in lands with no % increase ,they have new members, as at least 1% of their membership will have died during the year.
However, I also believe they are facing a crisis point, as the generation that grew up with the internet become parents themselves things will change very suddenly.
When you become a parent you start to ask questions about how to make decisions, not rely on others to make decisions, so these new parents will form a class for whom suddenly a light goes on.
Love
Wobble
p.s of course as Nathan N pointed out above, there will always be those who like to be told what to do,how to act and what to think, so the WT will be left with sheep, what we call mutton-heads around here. The thinking ones with at least two sparking brain cells will leave.