I really don't think the majority of JW's would do it if ordered. Perhaps the Witnesses of the 1960's, or 70's...maybe 80's. Now, no way. Things are different these days, I can sense it when speaking to people.
I really believe many JWs are just going through the motions most of the time and they are hoping that the GB is right about things. Deep down they could care less. The kingdom is far away for all but the most hard-core JWs these days. That being said, I am sure that there are also wacko's that would kill if so ordered by the 8 cylon's at HQ.