[albertzeyer]

The developer of the game has the responsibility for it. It's very simple: He/she can just release the code and game assets. That will make sure that the game lives on forever. Anyone interested in it will pick it up and port it over to new platforms.

Even if the developer does not do this, it's still possible. Some people will get the game assets and reverse engineer the game. There are countless examples for this. Unfortunately sharing the game assets will be illegal (at least for a while, until the copyright ends), so this will make it harder for the game to survive.

Also, there will be emulators at some later point, where you can play the original game binaries.