StingingVelvet: Are you on the right website? I mean isn't GOG all about keeping old games alive and replaying the classics, or discovering an old game for the first time?
Games are my movies, my theater, whatever. Just as I watch Blade Runner every year I want to play Fallout every year or so, or Duke Nukem. Of course I care if they are still able to be played, to be experienced. Why wouldn't I?
Metro09: It's one thing to care. It's another if you -- as you said in your original post -- feel compelled to avoid something entirely that you will enjoy in the first instance because it possibly won't be around in the second instance twenty years removed.
You've never had a game you truly enjoy disappear out from under you, have you? My first (and last) experience with that was Earth and Beyond. If you don't remember it, it was a space combat/trading/exploration MMORPG. It was shut down just two years after its release (actually, two days shy of two years). Had I known that might happen, I would never have even tried the game in the first place, or perhaps I might have tried it, but I would not have invested so much time and effort into playing it. That one experience colored my impressions of all MMOs to the point where I have actually never played another one, even if they look like something I might enjoy.
The worst part of the whole thing is, for several years after E&B went under, I kept my original install disks in the back of a cabinet, in the vain hope that someday someone would revive it and I would be able to play it again. Alas, it seemed like that would never happen, so during spring cleaning a while back, I finally threw them out. About 6 months later I found out about a fan-made emulator project that would turn the game into an open world single player game... if you still had the original install media.