I only have a 6 year old Macbook. It had a Windows 7 partition specifically for things like this, but I deleted it when I realized I hadn't booted into it in a year.
I have a couple of really terrible PCs that I only keep around for running Substation Alpha. I haven't a clue to their gaming potential.
I enjoy video games.
I think you are over estimating the requirements for Unreal Tournament GOTY. Any low budget Windows XP machine could run it as long as the cpu is in the 800mhz range and the graphics card is on par with a Nvidia TNT or ATI Rage 128. This includes gpu's like the onboard Intel Extreme graphics. If someone had something like an old Dell laying around, odds are the Dell would run the game fine if the Dell is from 2000 on up.
At any rate, just strikes me as odd that people would get by without a pc in the home. I mean yeah, it can be done, but personally I hate trying to type on tablets and phones, let alone do normal web browsing and online purchases on them. Even for casual use that feels painful to me. I guess though if thats all you got, then thats all you got. If anyone does care to do so though, you can buy cheap Athlon 64 and Core2Duo computers on ebay now. Would make good Xp legacy machines for old games.
For the foreseeable future I will have an actual computer, most likely a MacBook. The one I have now is getting old, but computers haven't really advanced much since I bought it so it still runs everything but games really well (I don't play computer games).
The phones and tablet stuff is fine for times like when I'm bored at work (this moment, for example) but when it's time to get shit done I need a real machine. You can't run Logic or Photoshop on some doodad with a 1GB of RAM, that can't properly multi-task, only has a single input socket, etc.
What you can do on a phone just fine now is buy tons and tons of shit, which explains the popularity of them. Now you can buy shit while riding a roller coaster, while taking a shit, while driving 80mph down the highway. It's the American Dream in your ketchup stained hand.