Obviously the option
to own a physical representation of the song will have a market value. At this moment, due to novelty or actual worth, that price is $.99/song. It will go down with competition and economies of scale (volume). For me, the ability to burn a CD for myself, my friend, my granddaughter, et. al., none of which have a commercial remuneration for me, is important, so the subscription model that times out is not what I want.
Really, it seems to me, when and if the "boys" get this together, the mass marketing value of internet downloads will have to do with the ability to buy the LATEST MUSIC WITHOUT EXCEPTION. Subscription services, and even APPLES' store don't allow (much) this. That's the only way the playing field will be level in the competition with hard-product sales.