I think the traditional models of production and distribution are going away unless governments around the world decide to allocate greater funding to the arts, which I can't see happening any time soon. Although the internet will continue to bring greater exposure to classical music, through free services like YouTube, no money goes to the performing artists through this means of consumption, so the music benefits but the industry does not. For this reason I can imagine that companies like Deutsche Grammophon are going to become too great a burden for their parent companies to sustain, and will be let go, their catalogues gradually entering the public domain, their platform of distribution then becoming one of the legal uses of BitTorrent and p2p services.
I think it is entirely possible that the funding situation both for composers and for ensembles will return to patronage of one form or another, most likely on a per project basis via crowdfunding, and that live performances, especially of large scale works, will become increasingly rare owing to the high costs involved. It follows that computers will become much more popular for the purposes of realising what was previously the domain of orchestra, and that this technological paradigm shift will influence the direction in which new music develops. However, for all the openness and therefore widening of appeal this, in addition to the suggested models of production and distribution, implies, I can't imagine a time when composers will be just composers, they will have to find alternative means of supplementing if not generating income, because it seems that idiosyncrasy will also increase, and this entails in fact the narrowing of appeal.
Maybe this sounds like hell to you, I don't know, it's just what springs to mind when I think of music 50-100 years from now.