Not really applicable. Digital music really took off because people were suddenly using media such as phones and MP3 players to play music that were physically incapable of playing physical formats. On top of that, digital distribution of music is cheap, easy and due to Spotify, containing all-encompassing libraries. This can't really be applied to games where a digital copy is priced often times even higher than the same physical unit, which you also can't resell, lend to friends or give away. The reason why physical media has endured so long for consoles is because the consumer conditions of digital is still horrible and extremely locked down. It's also getting worse year after year. They shamelessly price their digital games even higher than retail equivalent despite completely cutting the costs of distribution and retailer margins. How does that make sense? It makes no sense to me to support this predatory business practice.
Another thing to point out is that digital music didn't really start overtaking physical sales until the publishers decided to remove all the draconian DRM from the files they sold you. Before that, you had something similar to the current digital gaming space - you buy the game on a platform, and it's stuck on that platform (and can't typically be played elsewhere). Pour one out for my homies that had the massive music library on Zune.
Personally, I'd be all-in on digital-only gaming if the games were released in a standards-compliant, DRM-free format (similar to how MP3s became the de facto standard for music) that could be played on any device of your choosing. Maybe you buy the game on a PC digital storefront like Steam, but could also play it on PlayStation (or vice versa). Just like how digital music got so popular because people demanded to be able to play what they bought on the device of their choosing, digital gaming should be the same way. Only then will you truly "own" a digital copy of a game you buy.
But, it'll never happen. We'll continue to see more and more terrible DRM and walled garden storefronts, while people online point out that "digital music was successful, games will be too hehe".