There's a bit of nostalgia bias in this article, I think.
I wonder where this world is that newspaper writers live in, where ebooks have wholly superseded physical books rather than supplemented them. I have yet to encounter a consumer of e-books who did not also have a large personal library of real books. I don't really think there's a divide: people who like reading like having books to read, regardless of the form the book comes in.
I also think there's a bit of a confound in the study that they did. Households with a larger number of books in them have children who have better reading ability, but perhaps that has more to do with the types of parents that stock large numbers of books in their home, rather than spontaneous discovery of books on shelves by presumably bored children. I grew up in a house with a lot of books, but I'd attribute my own literacy to the fact that my parents started teaching me to read at age 2 and taught me by example to value learning, not to the fact that my parents stocked tons of books.