From Business Insider:
The chart is entitled “The Death of the Music Industry” but has nothing more to offer to justify that explanation in the original post. Rather than speculate on that and in looking at it from the library perspective, all I can see is a shifting of collection budgets from CDs to digital content. And in going towards digital music content, that brings up a whole new ballgame regarding vendors, what they offer, how they offer it, and the rights and licenses that would be involved with that. There will need to be robust platforms in order to provide support for an increasing scheme of digital music content.
Unfortunately, this graph needs about four more years worth of data to give a better picture on when the CD will be virtually obsolete and how much digital content will take over the market. But those CDs we own are going to be museum ready in the next ten years. I think it emphasizes the importance of having a website that can handle more digital content that will be coming down the pipeline.
Edit: Changed some wording in the last paragraph. Thanks Steve for pointing it out!