Between DRM, DLC, mandatory connectivity and the end of physical media, the future will look back on this era as the 'dark age' of digital gaming history. Maintaining activation servers, cloud storage and digital delivery costs money. If it doesn't disappear when the title reaches EOL, it certainly does when the company is gone or shifts business models. And draconian copyright laws create legal jeopardy around orphaned games from long-dead companies while the DMCA makes it illegal to remove DRM.
We simply have no way to preserve games.