Once you're on the iPad/Kindle Fire, it's so tempting to do other things too — email, Facebook, Googling here and there — that you lose the single-minded concentration that pulls you straight through a book.
Not that everyone reads books that way. You might have piles of paper books around the house that you dip into and keep meaning to finish. The nice thing about ebooks is you don't see them lying around and feel guilty.
Me, I've found a way to read ebooks that gives me that internetty feeling I love. I have hundreds of books in my iPad (where I use the Kindle app, and read books bought on Amazon). I keep my list of books in the order most recently read, and I like to pick something near the bottom of the list, read it until I get itchy for a distraction, then select another book near the bottom.
Why not? Well, the linked article takes the point of view of booksellers. They're worried people will stop reading things in book form. Me, I'm a blogger. It's a market. People will buy what they want. There are other choices that to be trapped in one author's mind for days on end.