There's a problem with that logic, and I really wish you would stop spreading it for the sake of all gamers worldwide. Running a 32-bit process* in 64-bit Windows can actually degrade performance when it does not require more than 2GB of RAM (and most games don't require that much memory. In fact I can't even think of one PC game that does, even at maximum eye candy!).
And I really wish you would try things out before lecturing others. Experience doesn't translate into fact, of course, but you seem to enjoy following me around, disputing things I post (that are facts) simply because you don't agree with me. CoD:MW has already been using 2.5 GB of memory for me in task manager. Hell, I've seen Sims 3 go over 2 GB on my wife's laptop.
I'm also going to borrow your viewpoints for a second, and steal a comment you used against me in another thread. If a game is using a lot of memory (like a VM, as you said) that would degrade performance for the rest of the system right? I often play a game or so while I'm running other apps, like Handbrake, or something of the sort that can queue up a few jobs.
Here's my suggestion to you. Instead of following me around to disagree for the sake of disagreeing, just try this stuff out on your own. I'm being 100% serious. My proof is that you aren't keeping a linear argument....you are jumping sides of a debate, just to disagree with me. Try this stuff out...that's all it takes.
I'm not one of these people who talk about a subject they don't know about. Forums are littered with them. If I type something, it is either a fact, or something I can back up with experience. Don't treat me like ones who spout BS.
By the way, in the spirit of facts, running games on x64 Windows doesn't degrade their performance. In fact, some would tell you that due to the better memory management, the games run better. In keeping with my philosophy on forums of only speaking facts or my own experiences, I'll tell you that my experience has not been such. I can't find a repeatable difference between x86 and x64 in terms of gaming with Vista, or now with Windows 7. The FPS differences are will within margin of error, and close enough to call it a draw for me. Many review sites are also showing them as the same, and a small few are showing x64 in the lead.