Yeah with World War 2 only a couple of years earlier i think the focus would have been more on the War effort and less on learning how to read and write. There still would have been some of this going on but nowhere near what we would today.
Really though i never said that it would not have been a popular book just that it would not have been as popular and as big an uproar around it as we see with things like Harry Potter. What i have said is simply my opinion as to why this may be the case.