I'm with Zico, we will not see a decrease for a while because of the Watchtower's thrust into third world countries as well as outreaches to foreign language groups in first world countries like the USA and the United Kingdom.
However, just like any other apocalyptic group, time is against them. As the world continues on, day after day, year after year, with no Army-geddon in sight, people will inevitably lose interest therefore change and readjustment become necessary. The WT's tactic so far has been to push Armageddon into the unknown (but real soon!) future. Even this will wear thin in time. I wonder what their future tactic will be?
I'm sure any closet reformers at the Watchtower headquarters are well aware of the radical reform undertaken by the Worldwide Church of God ( an organization similar to the Witnesses in practice and teachings) in the late 1980's and how their attempts at mainstreaming led to the splintering from which that organization never recovered.
...but change is a must, unless they want to see their org die a slow painful death. I'm interested in seeing what they try. I think we are already seeing the beginnings of change with these tract campaigns, making service easier. What's next do you think? What ideas do they have up their sleeves to stave off the inevitable? It's interesting to me to watch the org in its death throes!
CyrusThePersian