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The reality is that IP networking is still a very effecient way to move medium amounts of data to various destinations without having to manually wire every point together. There are very few options out there that work so well (such that IP telephony is becoming more and more popular as time goes on).
There are the ongoing issues of security and usability. Working to stop things like anonymous proxies, easily corrupted headers (email, example) and other issues will help to secure the current network.
Yes, a clean slate might resolve many of these issues, but that is a bit like trying to change the tires on your car while driving 80MPH. I wish them luck, they can go join up with the internet2 people and call us when it is ready.
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