I think this prediction is optimistic.
In truth, since the past year I've bought everything online. Books, games, gadgets, computers, songs, movies, etc.. And had them delivered to me. Never bothered leaving the house.
The only thing I had to leave the house to buy was my iPhone.
I'm sure more and more people, as me, will find it more convenient to buy online, and more and more will find it more convenient to purchase or rent them from iTunes and similar services, than on...