If you're worried about long-term hardware failure, physical mediums are WAY more problematic than digital. CD/DVD are expected to fail very often after 15-20 years of age, even in good storing conditions. Even worse for writable ones.
I still sort of do. I wish PC gaming never got into this DRM hole.
Now its likely I could never play my games again in 50 years. Whereas I can still pull out my old intelivision and play that.
Not a reason not to like steam. You are guaranteed your games if steam ever goes offline for good.
Because their servers will forever be available for download?
That's not a DRM issue. That's a digital download issue.
GoG doesn't have DRM, for example, but you still need to download the games from there.
GoG lets you download the installer. Steam does not.
Give this a try. Use steam to backup your games. Put a power drill through your hard drive (or just format it, whatever is easier) Disconnect your internet. Use your backups to reinstall your games (remember, the steam download is gone).
While you are trying to figure that out, the majority of disc based DRM free games continue to work.
He who stumbles around in darkness with a stick is blind. But he who... sticks out in darkness... is... fluorescent! - Brother Silence
I remember when *I* used to hate Steam. And to be honest, when it started, it was basically a worthless pile of bloated, buggy crap. It had none of the convenience features it has today in terms of library management or the store.
"How do I get rid of a Trojan Horse?" -Sailor_Kakashi "Leave it outside the gates of Troy overnight." -Davel23