Well, true and evaluating old games...NES, Atari, NEC turbographix, X68000, Sears arcade machines...still around. Still playable.
What has happened to some is that it has lost patents and became either public domain, or it was bought out by someone else. Hell, that sounds cool, buying a gaming company that went under, and all its assets.
@ topic: continuing on... I did the steam thing. It isn't so bad. However, it's impractical to assume it will move this way in such a significant way much more than it already is. Consoles will never truly be replaced. IMO there are more loyalists in the overall gaming population that believe console is truly is "where it's at". IIRC awhile back someone tried to have this whole campaign for a product to replace the console and all games with one device with connection to a worldwide network. It failed for the same reason it would fail today. People want hard copies. The lag = frustration.
Such a thing as steam requires paypal or credit card. Even if you can validate a throw-away credit card easily at K Mart and do it all like that 1-2-3, a-b-c, frankly computer gamers are still a small population among gamers as a whole, though super serious computer gamers will more than likely have steam. Point being, most people outside that sub-population don't even want to bother with it. Too much hassle. Don't care anyways.
Some will do it ant the rest won't, it's as simple as that. Period.