Should ISPs cut off bot-infected users?

Found on Computerworld on Monday, 04 October 2010
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While ISPs can't prevent users getting infected with bots, they are in a superb position to detect the signs of infection.

The idea is that ISPs could detect signs -- say, by intercepting outbound spam, or botnet command-and-control traffic -- and cut the infected customer off from the internet.

I don't like the idea of having my ISP monitor every byte going through the cable. While it might be a noble reason, it opens the door for more monitoring and filtering (RIAA, can you read this?).