> Each network node stores only content it is interested in [...]

Isn't that the issue here? Storing data that will maybe be there later isn't really storing data. People want to publish something that must always be available, so why inject data into the IPFS network and hope it will be there in a year, rather than set up a $10/yr VPS?

    > With video delivery, a P2P approach could save 60% in bandwidth costs.

In my opinion, this may be true, but total costs will be greater. P2P solutions are awesome because they are resilient, not because they are cheaper. Distributing pirated movies by dumping them on public FTP servers is much cheaper than BitTorrent. BitTorrent appeared because the centralized method was not resilient enough against adversaries, not because it was cheaper (quite the contrary).