I dont think file sharing is the big problem - i think the problem is, that music has been degraded to fast-food. A cheap mass product that is good for making money. Recording industries have encountered a drawback of about 60% in sales lately - you can for sure not trace that all back to mp3. Its the quality. Peeps seem to slowly get sick of whats goin on. It has been the same for years now - there has been nothing new - the same old crap all day long on TV and Radio.
Maybe this is the point where music industry has to rethink its policy and maybe start to sell real music again. It hasnt done that for the least 30 years now...