If we want our stuff more permanent, this will be a change from the past that we need to specifically enact.

It’s being done for a lot of stuff, just not videogames.

From the linked article:

Libraries and archives can digitally preserve, but not digitally share video games, and can provide on-premises access only

Libraries and archives are allowed to digitally share other media types, such as books, film, and audio, and are not restricted to on-premises access

The Entertainment Software Association, the video game industry’s lobbying group, has consistently fought against expanding video game preservation within libraries and archives