Let me first say I'm not really your "stereotypical" gamer. I'm 41 years old for starters (old enough that when I reveal my age while playing a round of TF2 or what-not, someone always goes "Woah! No way!").
I don't really do a lot of gaming because hey, I've got a full time job and family at home.... It's more of a way to unwind before bedtime once in a while, or to kill time on a slow weekend, for me.
That said though, I've been into console and computer gaming since the Atari 2600 days, and I've seen a lot of stuff come and go.
I'm not sure what the next generation of consoles will bring, but there are a lot of rumors and indicators out there saying BOTH Sony and Microsoft want to lock game purchases down so it's not possible to resell used titles anymore. If the Playstation 4 and next XBox do this? I think they're going to find a huge backlash! It could be just what's needed to see gaming come back to the Mac and PC.
I think the biggest reason this might not fly has to do with pressure put on them by other retailers like GameStop, who would effectively be put out of business with such a move. But I'm also not sure they're a big enough player to force the hand of Microsoft / Sony? They might just evolve and start selling more PC software titles, or specialize only in "vintage" items?
Maybe the plan is to go all digital, similar to Steam - but on a "console-wide" level? No more blu-ray disc player and titles on optical discs? But that would also mean no more console gaming anywhere you don't have a good Internet connection.... Again, that will turn a lot of people away.
Whatever the case, I think there's a general "vibe" out there (including in the top ranks at Apple) that we're entering some kind of "post PC" world, where people will mostly dump their personal computers in exchange for iPad type devices. Those same people seem to believe the smartphones and tablets will eventually take over the whole gaming scene. Personally, I think that's ridiculous. A tablet is a better solution than a computer for SOME people with certain needs. It's never going to be a direct replacement though. You'll ALWAYS be able to pack more video processing and raw CPU power in a full blown computer than in a light, thin device with only a touch-screen for input.
The tide is turning ... and all I know is, we're in for some interesting changes in the next few years!