If they like it or not, the model of business has changed.
It's not the good musicians that need to worry, musicians make more money touring anyways. Or, they make plenty of money touring.
File sharing helps independent artists get out there, it's going to be good for music, bad for the old-model of doing business where people in suits take a artist they think has marketing potential and get a bunch of professionals to make them into some iced package to sell.
File sharing has already helped music. People are finding all kinds of quality music, seeing people live they would have never done before. I can't tell you how many shows I go to and people found the band by ganking their music off the 'net.
I'm very optimistic about the big picture of this, but I think we'll see some tough stuff in the short run.