It is rather clear that the internet is to put it mildly, wrecking the world of the Watchtower Bible & Tract Society. If not for foreign language I doubt there would be much growth at all.
Digital trends and analytics are very real. Don't think they don't mean something. I live this analytics world I assure you to some degree you can take it to the bank.
Add to the fact that Christianity isn't even enjoying the fastest growth among religions. Islam will soon overtake Christianity as a whole. Meaning JW growth really isn't in the equation.
So much for expansion and growth as makers of the true religion and God's support.
Report from the Mirror
http://www.mirror.co.uk/news/world-news/islam-fastest-growing-religion-overtake-6986333