If previous acaryas insisted in printing books and book distribution, for this day and age they would say "open schools". Why? Children are getting so badly spoiled from bad association and atheistic educational systems, that by the time they reach 18+ they are completely out of control.
Internet allows book distribution to the whole world in a matter of seconds, so that's not a problem anymore. The problem is that by the time people get real knowledge, there's countless bad habits that are almost self-destructive, this makes change much harder. Many devotees spend a lot of time distributing books only to find that very few people can even read them or understand them. People are too much blinded by materialism, the spent years in school learning it!
So, yes, we passed the book challenge. Now it is time to educate young kids early, help them remain clean and sober. Become nice devotees and show the example to others.