It's scary to think about all the games we're going to lose because so many games are implemented as SAAS nowadays. As someone interested in gaming history and the preservation of games it's actually quite saddening.
Consider also the download-only releases of console games, usually by indies but not always, nowadays on the big 3 platforms; other than avenues like Limited Run Games that provide for production of limited physical runs of previously download-only titles, they're lost to the aether eventually.
That's putting it mildly. Gameplay videos is all that's going to be left for plenty of games.