Steam is a ticking time bomb but mostly for the reason that you don't own the games you purchase there and you can't back them up (mostly) so when Steam decides to ban your account or just closes down, you lose all of your games forever.
More people should push for DRM-free games with offline installers, like GOG and Itch offer.
Idk, there's a backup system that I've put on a hard drive with a very easy to find GitHub steam drm remover. Haven't had any issues playing my games without a steam account -- sans online services for some, but most of the time I'm on trips or without Internet anyway. That said, if the idea is that in some 5-10-20 years this will happen, I feel like a lot of the online services won't be around... For as much as I love Helldivers 2, I don't really expect it to be around in 7 years. Online games from 2013 aren't all around either, and those that are aren't super populated.
On the other hand, a lot of these online services do rely on Steam, so if it went down a lot of them would need the same unofficial online servers.
I'd be more concerned if Steam were to have extreme DRM, but it's so laughable that it's literally worth paying for the game just to have the streaming/per game notes/cloud saves and for current games to not have to deal with updates and online services. But a Steam Library of mostly single player games? Anyone who is concerned can get a $50HDD and install/backup their games with Steam to and then apply the patch. Of the issues Steam has, I think this particular one is low on the list. And per the articles issue, I would actually blame the OS more than the storefront. I used to game on Mac's from 2007-2013 and let me tell you, Steam was a freaking triumph. All the Mac game stores were truly short lived, had poor support while they were alive and had things like license activations per machine, so good luck past 5 computers (talk about 15 years). Back then Aspyer ports were really great too, always something to look forward to.
Back then Steams issue was that it didn't have refunds, Tuesday Maintenance, and sometimes it would just be buggy for a bit when trying to open (on OSX -- never really had an issue on Windows). Since then they've only made it more service oriented, doing things they absolutely should, but didn't have to, like refunds applying to everyone after the AUS lawsuit instead of just that region. Looking at Apple for this one.
I would implore the author of this article to go back in time, get their games on the macgames store and other similar storefronts for OSX and I would wonder how they fare today.
I have my accounts. I have no access to those games because licenses were activated too many times or because they no longer support the current OS. So I'm effectively limited to a previous version of OSX which cannot download the app because I need a new version of the OSX store. I don't have the right terms but it was hours of hassle to find out that my OSX copy of Borderlands, Assassins Creed II and Brotherhood, and a couple others are just gone. To add insult to injury, I had to log into the account every year to keep my "platinum points" that you got for buying on that storefront, to use for discounts etc. I didn't log in so byebye incentive!
My point? I had about 250 SteamPlay games that I bought and used on OSX as a Mac gamer, which seamlessly downloaded on PC when I switched to Windows for my desktop computer. None of this is to say that Steam doesn't or can't have shortcomings, but rather that it is a substantially better service than than pretty much every alternative right now, save for GOG probably.