I think it will level off. Amazon, though, will be changing its business strategy. Then there are the niche players. If someone already has a catalog business, then the Web is, in a way, a cheap catalog. One is luggage and liquidation.
Luggage is a horrible thing to sell in a store.
Luggage costs a lot to have on the floor and in the back of the store. Retailing luggage has never been a good business, but it can be on the Net. Say you have 127 DVD players. Best Buy doesn't want those. It's not worth the real estate in the printed page.