One problem with blanket banning p2p would be the loss of skype and similar legal systems
Quote:
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The main difference between Skype and standard VoIP clients is that Skype operates on a peer-to-peer model (originally based on the Kazaa software[54]), rather than the more usual client-server model.
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Taken from wiki
http://en.wikipedia.org/wiki/Skype#System_and_software
It is worth remembering that
NOT all p2p is illegal and some can be very useful. I believe Linux is distributed in a similar way