I actually found that article pretty good. Maybe I don't agree with all of it 100%, but many things seemed spot on.
I was especially delighted to see him mention also DRM as one of the obstacles for keeping old games alive. I was expecting him to dismiss it by merely "Well, DRM doesn't matter because as we all know, Steam will be among us forever, and even if it disappeared, Gabe has promised to unlock all Steam games at that point.". :)
Related to that, he could have mentioned about the tendency to make forced online features on single-player games. Diablo 3 being a prime example. Those can't be solved with mere cracks, like more classical authentication DRM can.
Also good to see he mentioned consoles are even worse off in this respect.
So all in all, keeping old games alive will become harder and harder. Many current games (especially on consoles) will disappear from the history at some point, something that rarely happens to e.g. books or movies anymore. Things like WINE will salvage maybe some, and the biggest enthusiasts (like me) will try to run old Windows systems on virtual environments, just in order to run some old games. Most probably having to use cracked Windows versions, that don't need online authentication (as the MS servers for those old Windows versions are most probably offline anyway).
GOG versions of modern games will probably be the easiest to run in the future. :)
EDIT: The ending summed it up pretty good:
Sure, we'll always have classics like Tetris and Doom. But what about oddballs like Crackdown, Prey, Heavenly Sword, Jade Empire, FUEL, Thief: Deadly Shadows, or one of the other thousands of games that didn't become legend, but have a small following of devoted fans? At least some of those games will die with the hardware they were designed for. And that's a tragedy.
I don't feel quite as powerless as the writer though, as if "nothing can be done". WINE is one example of something being done. The project to create a virtual Direct3D graphics card (which could have several different feature sets) would be another. And as a customer, I can favor e.g. DRM-free games that are more future-proof.
Sure, we can't necessarily save them all, or even most (and naturally everyone has their own priorities for games worth saving; e.g. I couldn't care less if I can't play Candy Crush Saga in 2050). But we can try to affect the future.