Will they still go door to door preaching?
Since it is a legal right that had to be fought for and blood was shed for it, the wt will never abandon that right. There will always be some door to door preaching, unless, the law changes and the wts looses that right, then I do not think that WT will fight for it again. Anyway, 100 years of preaching all over the world just about covers it, in relation to generation hearing it and dying . Cannot see the door to door and preaching going any further than 2016. If they manage to keep going a couple of more years, 2020 is the limit. The WT stops in 2020.
A lot of changes will happen in WT teaching if nothing happens in a year. The Warwick building project will keep everyone busy until 2017, but that is only in the US. I think that everyone believes that the GT will come within a couple of years.