Re: Chicken and Egg
Isn't it just that we're at an evolution vs revolution argument? The ones that need everything to be re-bought tend to be the revolution ones, whereas the ones that are "backward compatible" are the evolution ones. And it tends to be the revolutionary items that need (and hopefully give) the incentive to update.
Film projectors --> VHS - convenience of viewing on the telly, plus being able to fast forward/rewind easily without the risk of your media ending up around your feet.
VHS --> DVD - random access, bonus features, not having to rewind the damn thing afterwards, physical size (for physical storage and transportation) and durability.
DVD --> Download/Stream - playable on wider range of hardware (e.g. phones and tablets), no physical media to store (but nothing to own either, plus DRM), reliance on net connectivity.
Blu ray of course was an evolution of DVD, giving nothing new, just stuff that was better (resolution mostly, but also maybe more extras due to higher capacity). Blu ray 2 (or Violet ray, or whatever it will be called) will be more of the same, but again better still for resolution.
I would wonder between discs as physical media and streaming for non-physical if there would be anything more that could be revolutionary rather than evolutionary, as there's not much more that could really be bolted on or made more convenient?