I thought I would check in, given I get a mention above.
I have done a few threads on the Aust census statistics. The following is the last one I did. (Look at the graphs on page 2, as some of those in the opening post contain an error.)
Essentially, decline in Australia is "locked-in" and inevitable, now. Because their median age has risen over the last 10 years, they are entering a stage where deaths will outnumber births, particularly as the baby boomers die off. It will be a slow process, however.
Also, someone on a separate thread about 5 months ago showed that adding up all publishers across Europe, showed a small decline. I noticed that adding in the major wealthy countries (USA, Japan etc) showed a slightly greater decline.
So decline is real, at least in the West. And this decline is unrelated to whatever financial issues Watchtower is currently suffering.
Btw, I also agree that the number of congregations is a reliable measure of growth/decline, as it is a hard one to fudge.
Back to the O.P. I don't think the Borg could stoop to murder. They are quite likely to stoop to Scientology style tactics, though.