There's always going to be a way to find content digitally. If your hard drive fails I'm sure the same content will be available online elsewhere except possibly some rare, very obscure piece of content that no one would remember to begin with.I still buy physical but truth is games are all digital now. The version of the game you get on a disc is incomplete and usually a pre-release version. The disc is just a method of installing a digital copy and from then on the disc is just used to authenticate your license.
There's usually a needed day one patch that brings the game to an acceptable level. Thing is when they shut down the servers for your old console in 15-20 years you'll no longer be able to get the patches the games need to make them playable or to reach the proper version.
People who owned the Wii are about to experience this next year they're taking the Wii servers offline.
Your comparison to music and movies is flawed because both aren't tied to a piece of hardware like a console game is. These companies don't want to maintain their servers a day longer than they have to. If old hardware doesn't maintain the needed playerbase to be profitable for the company it's lights out and yeah at some point if you don't download and archive yourself on hard drives that will possibly fail one day you will lose access to the content you purchased.
This thread was never about the fear of losing access to a game. That fear doesn't hold any water considering access to any game whether physical or digital can be taken away from you over time if they really wanted to.
My whole point with this thread was a growing concern for how as we go to a completely digital world, compensation isn't clear. No one can define what one stream is worth, or one download, yet top tier content still costs as much to make as it did (generally speaking). What I fear is that given enough time, the arts in general will be cheapened and consumer experiences will suffer,