It would not be hard to improve the NNTP protocol by adding additional checking/verification so that uploads would not get corrupted in transit (and servers would constantly check and back-fill from each other, but that's another story).
The big question is who will do it? There's really not much of a central authority anymore. Last year Duke University -- where Usenet was born -- finally shut down its NNTP server and related operations, and the academic community had largely abandoned usenet years earlier.
Code:
http://news.slashdot.org/story/10/05/18/2342241/Duke-To-Shut-Down-Usenet-Server
http://news.slashdot.org/story/10/05...-Usenet-Server
Companies like Giganews, Highwinds, Astraweb, etc, could certainly get together and crank out an improved protocol that would be optimized for transferring files (as NNTP was never designed not intended to do) but I think the biggest obstacle by far is the political/legal considerations. Designing an improved usenet system that makes it easier and more efficient for the public to infringe copyright is virtually guaranteed to land these companies in court -- a situation they'd definitely want to avoid.
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