Yes, some irony in that Rutherford, the writer of that book, was not one of those millions. Essentially they are selling the same message today, hoping that though it wasn't true then, it may be today.
WT 4/15/2005: "Notice how Jesus expressed these two thoughts. When speaking to Martha about the resurrection of the dead, he said: “He that exercises faith in me, even though he dies, will come to life; and everyone that is living and exercises faith in me will never die at all.” All evidence shows that this “day” is very near, which means that you may “never die at all.”
Jehovah's Witnesses might like to give some thought to an illustration in a November 1995 WT:
"IMAGINE a weather forecaster whose predictions almost always come true. If he predicts on the evening news that it will rain the following day, you do not hesitate to take along your umbrella when you leave the house the next morning. His past record has won your confidence. You act on what he says."
What would be the appropriate action for a JW who has watched more than a century of predictions by the WTS that have failed, one after another?