The games that are going to be the hardest to preserve may end up being many of the mobile games that are popular now.

These games are usually installed through an app store, so if the app store pulls it, that could be it for new installations of the game unless the game can be extracted off an existing device. And even if you manage to extract the game off of a device, in order to get it onto another mobile device will likely require some way to side load it.

Many of these games also depend on a server so once the server is turned off that's another way the game to die.

The mobile devices these games run on aren't built for the long term either. They are essentially disposable devices meant to last a few years and then be tossed. They aren't built to be serviced or repaired. Eventually the batteries will die, and while you can replace the battery, there's no standardization of battery packs and eventually replacement batteries won't be available either.

Even if you can get an old mobile device going, there's no guarantee that you'll actually be able to do anything with it, because the device itself may depend on some remote server just to function that could someday be shut off. There's already old phones today that if you factory reset them, it effectively bricks them since they need to contact some activation server as part of the initial setup process and that server is long gone.

Of course, many people may ask - who cares? Perhaps so, but I'd bet a lot of people said the same thing about the old Atari and Nintendo and Sega and MS-DOS games that were popular years ago and are still popular today.

It's kind of interesting that pretty much all the games I played as a kid are still accessible to me today - in many cases the original game is still playable on the original, still functional, hardware. But a lot of kids today growing up today playing mobile games on a phone or a tablet, when they are my age, could very well have no way to ever experience those games again that they grew up with as kids.