You can't count on these companies to care about the consumer past the initial purchase. If you can jailbreak your console there are plenty of sites that preserve the released games that you can install after the online services are shut down.
For instance we actively dissuade people from taking photos during foreign trips or at the restaurant because they're supposed to be enjoying the experience, instead of viewing it trough a viewfinder.
We haven't reached a point yet where people are arguing they should have a copy of the tiramisu recipe and backup access to the kitchen in case the restaurant shuts down and they can't have their tiramisu anymore.
In some way, I wonder if most online games nowadays aren't closer to a tiramisu experience than something we are supposed to own. Fortnite for instance would be fundamentally about the experience of interacting with other players, the seasons system etc. and "owning" the game offline would be completely different.
I still see RPGs types of games and fully offline playable games as something that should be priced differently and have a more standard ownership model. Things like Super Mario Maker mentionned in the article would be sitting in the middle. Also preservation efforts should continue on an academic and cultural standpoint, to at least leave some trail of what was happening in the gaming world during our time.
Now to get back to the tiramisu part, I think what makes it delicious in some restaurant is either obfuscated (e.g. the chef has a specific way to process some of the steps, or use some benign undisclosed ingredient). Or it's based on a specific ingredient that won't be available to anyone seeking it. For instance the coffee they use come from the chef's own farm, or they grind it a specific way that only works with their machinery as they haven't gone public about it.
In many ways I think the generic recipe of most games is widely available: if we gave you a team and a few billion dollars, you could probably make a generic Fortnite clone in less than a year. But would it be as good as what Epic's team is providing right now ? probably not ? (no offence)
So, while of course there are many widely known and available tiramisu recipes, a specific recipe from a specific restaurant is not necessarily so. Just in passing, this is something that many people who wish for an end to software copyright forget: the alternative to copyright is not at all free public software, it is trade secret Linux "recipes".