people are building (and/or have already built) systems that allow parties to transfer both pure-digital-only assets (images, videos, music, ebooks, etc), and,

people are building (and/or have already built) systems that allow parties to transfer both pure-digital-only assets (images, videos, music, ebooks, etc), and, the rights to RL assets (eg. a goat, a painting, a vehicle), both "on top of" the Bitcoin network/architecture as well as via completely separate but Bitcoin-like systems. Systems which are also distributed, anonymity/privacy-optimized, resilient, globalized, bureaucracy-routing-around, efficient, automation-friendly, fee-less, built/run by engineers & entrepreneurs rather than by politicians/lawyers/bankers/aristocracies, etc.