When I put that to a dub relative though, the answer that I got was that if God could foresee wanting to save upwards of 7 million people then he had to start early to allow enough time for the Organization to grow that big ....
The real problem here, of course, is that a fully-indoctrinated JW can talk himself into anything. That's how mind-control works.
In Russell's time they believed that the end was coming in 1914, not over a hundred years in the future.
That's part of the problem right there. Further to your and BluesBrother's comments, this religion was founded on a premise that the Armageddon would come very, very soon. As the years have passed (131 years since the first Watchtower was published), JWs have simply failed to explain this simple, yet gaping, hole in their doctrine. I suppose JW leadership doesn't notice it or hopes their followers won't (I know I never picked up on this while I was still in).
A corollary to this point, and a subject that has previously been explored on this board, is that the great crowd that was "identified" in 1935 is supposed to make it through Armageddon alive. If those individuals identified by Rutherford as the great crowd (multitude) all die off, as they most certainly will soon if they haven't already, then they were never really the great crowd to begin with. Rutherford would have necessarily made an error in his identification.
This second point, however, is probably more confusing to your run-of-the-mill, rank-and-file Witness. I doubt more than a quarter of active Witnesses know that the great crowd was supposedly identified in 1935. The first argument I made initially seems to me to be easier for an indoctrinated Witness to understand. Cognitive dissonance may require that they explain it away like BluesBrother's relative did, but you never know what might begin the independent thought process in an indoctrinated Witness. I know that after many confrontations with religious people in the door-to-door work I finally began to see that Witness arguments were not as strong as I thought.
Going forward, the interesting feature will be whether the Watchtower bothers redefining their doctrine to cover up some of these inconsistencies or whether they will simply stop teaching a lot of this and hope people forget (in the 1975, Eve was created after Adam mold).