"I say the growth stops this year and starts to decline. I give it 10 years before the numbers are cut in half, that means 4 million publishers and in 15 years there will not be anymore JDub org. "
Watchtower will not be around forever. As to your prediction above, I tend to go along with the growth part and say they may have already peaked and are using manipulated numbers (not necessarily lies, but inaccuracies based on little slips of paper from congregations around the world turned in all at once to raise 'peak' numbers). I can even sort of go along with your 10-years thought to cut numbers in half- give or take. The members are mostly over 40 years old, much higher on the over-70 crowd. Their only growth is in small percentages of children of JW's.
I don't go along with them being gone 5 years after that, or even slightly longer. As Watchtower shrinks to 2 or even 1 million members, they will adapt. They will retain and recruit enough to stay alive for some more time. But I hope I am wrong.