Most of what I know came from books. Furthermore, books are friendly, welcoming, and "real". They are a true possession, while e-books are transitory. As long as you treat your books with care, keeping them dry and in a safe place, they can last for ages. Another thing--nobody can "hack" a book, the way a website can be hacked. And finally, with the constant changes in technology, it's inevitable that sooner or later your e-book reader will become outdated, while a book, itself, can't become outdated.
Our greatest literature in the world is contained within the pages of books. I remember there was a single panel comic of "The Family Circus" where Billy, the oldest child, has returned from the bathroom after setting his book down. He comments to his mother, "The best thing about a book is that when you leave it and then come back, it's still there." Of course at that time he was referring to compared to TV, but still....
And then there's that old joke--"Television will never replace the newspaper. Why? Did you ever swat a fly with a TV set?" Change TV to computer, and see how can still work.
One more thing--an e-reader needs a power source to use it, but books don't--unless you're reading in the dark, then you use a flashlight.