Well in a post apocalyptic world, it will be the people have the physical only games that can still play. The rest of us will not have the internet to download anything. So all of those hundreds of games that we have in our "library" but had to delete to make space for another game are not gone forever. So even though we may have purchased Breath of the Wild, we have no way of playing it cause we deleted it to make room for LA Noir or something.
Meanwhile, the person who purchased physical can pop in all of his collection at anytime. Well as long as the game isn't an "online only" game. I hate online required single player shit.
Can't download games in a post apocalyptic world since the internet probably won't work. Physical games master race :)
I am fairly certain that in a world without Internet we're gonna have a few bigger problems than games. Hunger, disease and war for example.
Those are but small issues compared to not being able to play my favorite games offline!
(if you haven't sensed it yet, this is indeed sarcasm)