With my current system it would make no difference then, because I have "just" 4Gb RAM. Core 2 Duo E8400, 1GB Video RAM and from what I can tell I can run all games that I need at decent frame rates. My next system will certainly have over 8Gb, so a 64 bit OS will be a must, but not right now.
Also don't forget that many people cannot upgrade for gaming, because they do work related stuff on their computers. When I upgrade I will probably need new versions of many developer tools, it's going to set off a whole domino chain of changes.
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