They are watching the orgsnisation slow down more than EVER, why would they decide now to speed up their voluntary work? In a recession, tired and poor. Any excuse for a break and they will hop onto it. i would be amazed to hear JW's were more active out of their own assumption about dates.
don't get me wrong, I wouldn't be suprised if some higher up's have fed the idea that this is an important year and some JW's may be responding to that. But I doubt that is a very overt opinion in Watchtower, after all. When 2015 does come around, it is just another dissapointmemt for 7 million people....
"oh darn it, the global genocide still hasn't come...!"