Excellent point! I have been crystallizing the same thought linked with the unimportance of 1914 for while now.
But you have the gist of my idea.
To the point - with that reasoning - why didnt the preaching work start 200 years or 1000 years ago - or never stop after Jesus?
The last day of 1914 just doesn't make sense on that level, and the Overlapping Generations does not fix it.
Lets never mind that world conditions have dramatically been improving since jesus day, so the bible prophecy is BS as is the catalog of Nostradamus:)