Isn't 300 GB too much?
An interesting discussion.
If screens stay the way they are and people do shift to smaller formats then quite possibly. However if the media types pull their heads out of their arses and decide to sell me entire runs of TV shows, filmographies of actors/directors on a single disc.
I am not hopeful here though as similar such things have been quite possible to do for some time now in all sorts of things and it has not really happened. Granted there is a huge inertia in terms of decades of IP licensing preventing it from working that way but hey.