What?
Legislation is a popularity contest. This is a democracy. It is only indirectly our popularity contest, but it certainly is a popularity contest among our elected officials, and people attempt to buy popularity daily. That is why the courts are so important.
Music means different things to different people. You are extremely cynical, ridiculously cynical in fact, to assume the music industry is, has always been, and will always be based on the vanity of the consumer. Sure, some people do select their music for vain reasons. They are called teenagers, and they only do it because the recording industry deliberately markets to their overactive, teenage sense of vanity. Stop the marketing, and the music industry lives on. However, anyone publishing music can no longer be sure what will be "The Next Big Thing" (tm), because they will no longer be in complete control of the content and distribution. Businesses have the right to take measures to reduce their risks, but not at the expense of competition.
The idea that any work in the public domain is unwanted with zero value is completely wrong. Most works will be forgotten, but that happens regardless of copyright status. Most works are completely unavailable long before their copyrights expire. It may have little money making value--though there are many businesses making money off the sale of public domain works right now--but it has much greater value culturally. Artists can make use of public domain works in their own works. Students can learn from public domain works for nearly nothing. A long copyright gives a huge advantage to the wealthy.
A top 100 chart has no bearing on this discussion, because it only gives a biased view of the industry. For every artist on that chart, there are hundreds of artists that are making music profitably. You write as if no one will sell anything without a seven digit marketing budget, but the truth is that most artists never have anything close behind them, and they still survive. In fact, they would probably do a lot better if the industry didn't push them into horrible contracts. With the marketing gone the industry would level out some, and I don't think that is a bad thing.