It's common and nothing new. The difference is that before the schools would accomodate this and now given the exclusiveness and divisiveness of schools, they can't.
If my dh were the sole carer for our ds, ds would have very little access to books and hence his reading would suffer. Why? Dh is not from UK, his english isn't great. In his home country he had zero access to books (but read at school) and he wouldn't tap into english language kids books.
That's one scenario.
Another is that both parents are non english speakers.
My dh comes from a household (abroad) with no books (in the last 18 years that I've seen, including grown up magazines or newspapers).
Illiteracy at home.
Many people are only interested in news - we tend to get that from tv.
My ds is a great reader at 5, but I was reading far more at his age. But so what. This is the here and now.
Our schools want far more parental intervention and I hear that libraries are closing. What are we to do?
We can all say 'I'm a great reader' but so what - how do we help this nation's kids?