I think that the quantity of music will be bigger than ever; but quality will suffer. I think that the music industry is decentralizing. What I mean by that is with the internet more people are being their own producers and distributors by placing their music on the web. The professional level studios will become scarce as budgets suffer from lack of revenue. That means less hifi level source material. One of the things we have enjoyed up til now is professional recording studios having equipment of such high standards that for most of us, our home hifi's will never approach the full potential buried in those recordings. Sure, we can hear differences in micing and mixdown; but what I mean is, the studios have gear of such a high caliber and cost that our home gear will never exceed that level. The future might be different. More music will be available but recorded on lesser equipment.
Parallel to some die hard classical music lovers today who hoard their treasured vinyl discs from the 50s-80s, hifi hobbyists may be doing the same in 2039 with their music on CDs up to the year 2020. That leads to another issue. I heard once that CDs are not considered archival quality- ie. they have a finite life span because the aluminum substrate can oxidize. So our precious CD collections may fade with us by 2039.
