The long and the short of it is that whatever happens any person who is experiencing cognitive dissonance about their beliefs and reality will simply shift the facts to suit their belief. Logic and reason are exactly what is missing.
When your eyes are open to it you can see that it's been happening for over 100 years. For example, the idea was essentially that 1914 was going to see the faithful raptured. When this and subsequent expectations on the system ending in a few short years have proved false then the logic changes so that Jehovah is simply allowing as many as possible to come to know him.
The fact that this means countless births of children into suffering is not a logical inconsistency. The fact that countless people are being born that will never hear the "lifesaving" message is not a logical inconsistency.
It's was bullshit 100 years ago and it's still bullshit now.