Chwdrhed..That may apply to music and some other products. But not all. Lets take books. They could all be kept in a central source, but who wants to go the the computer or to a hand held device to read a good book. There will always be books, including collector items, just like music 45s, LPs, 78s, etc.
People will continue to buy books for their personal use, unless you would prefer to have someone read it to you.
Some things will be better to be shared, and others will not, it's that simple.
It's becomes a matter of what it considered private and what is public.
Market Data 
Markets 
AI
