> attention-draining junk

To put it plainly, this attitude is probably the main reason reading books is sometimes labelled as an elitist poser passtime.

Kids will enjoy reading books that are genuinely good, but they need to care about the subject in the first place and they'll come for more on their own term. Focusing on the numbers ("X books per months") or denigrating the other things they also enjoy solely based on the format will just signal no shit is given about the actual content.