After reading the spec, it seems to me that this is a collapse of the HTTP (web) protocol down to the network/transport level. In effect, the internet would become one large heirarchical namespace where clients ("consumers") query the heirarchy of data by uri through Interest Packets and then some server somewhere sends back a Data Packet matching the specified interest. Alot like 20th Century TV, sounds like.
Also there is a provision for packet signature using public-key RSA which makes me think that it would be easy to instruct internet routers to deny passage for all packets not coming from or going to officially sanctioned sources/destinations should the need arise.... makes my paranoid little brain somewhat nervous....
This seems like a fun project to implement over TCP/IP, rather than to replace it. Afterall, there's no shortage of fibre (bandwidth) we could lay, so it makes little sense to abandon the "any peer to any peer" model of the current internet for one that might be better organized just to conserve bandwidth.
The more intelligence we put into the routers and network/transport protocols, the more the internet could start to resemble the old-style telephone company (or cable TV), where the devices on the edges of the network (meaning us) have very little.... creative legroom. This is something that I think we want to avoid.