Now, I'm exaggerating a tiny bit. I know emulation is a thing but my point stands... keeping all those physical media is a bother and having an unpatched collection of old games stashed on the attic isn't exactly handy.
Even if I had my old copy of, say, Heroes of Might and Magic II I'd rather buy it again on GOG just to have it neatly emulated and patched without the hassle of trying to make the original run on my modern system.
In the same way, I'm sure all those DVDs of modern games will be equally obsolete in the future and it will be far easier to just re-buy it digitally to run it on your brain-chip or something.
But hey, if you believe digital isn't reliable hold your physical copies tight... if war and disease ravages the world and society collapse you may have the last click.