If it was ripped out you know they'd find a way around it. Also, though DCC is used alot, alot of trading also occurs via FTP, so that would probably just grow.

Even though its illegal, you know they will find a way-heck a news page I was reading this morning was talking about networks like Kazaa, but they use proxies to block tracing. It may reduce the numbers, but anyone with time on their hands will apparrantly find a way still.