I always found that line confusing, look at this:
quote
1920 "Based upon the argument heretofore set forth, then, that the old order of things, the old world, is ending and is therefore passing away, and that the new order is coming in, and that 1925 shall mark the resurrection of the faithful worthies of old and the beginning of reconstruction, it is reasonable to conclude that millions of people now on the earth will be still on the earth in 1925. Then, based upon the promises set forth in the divine Word, we must reach the positive and indisputable conclusion that millions now living will never die." (Millions Now Living Will Never Die. 1920 p. 97
end quote
This is how the WTS viewed the world back then . A large part of the worlds people would survive armagedon. The million's referred to are evidently a group of persons other than the WTS and it's members. The WTS still had not identified the "great crowd" in 1925.and the WTS membership did not number in the millions.
Somewhere along the way the WTS doctrine changed and the only persons who would survive the armaggedon would be the great crowd (along with WTS)and all persons outside the WTS membership would be destroyed. So according to 1925 doctrine, persons other than the great crowd will survive arnaggedon. Believe!! It came directly from jehoover.!
This means that all the door to door work and kingdom service is pointless!