Over the last several years we have come to rely on Amazon for many, many things. Especially books. Amazon has been one of the leading companies in the promotion of ebooks, even launching their own reader, the Kindle. So, a world in which Amazon no longer sold books would be an interesting place.
It would be like Apple not selling iPhones, or Ford not selling cars, or Comcast to stop selling cable (okay - not so bad), or Mars not selling M&Ms! But, you know, every day some companies go out of business; businesses that people rely on and no one sheds a tear. Life goes on.
At some time or other, Amazon will stop selling books. What will you do then? In the meantime, head over to Amazon and get my books while you can... You know it makes sense.