Whoever told you they would be the "Standard" soon is a dork...
512MB Video Cards are still about a year off from release, possibly longer. They won't be "Standard" for probably another 3-5 years... Hell, its only recently that 64MB stopped being "Standard", and now 128mb is.. You'd be hard pressed to find a game using 128 as it is...
Next generation cards might have a 512MB version, but even that is in question right now, and rumors are going both ways. Most people feel 512MB would be a waste, since no games are anywhere near on the horizon that would even touch that, let alone the current generation cards. Let alone grossly overpriced, and they'd probably skimp and not use DDR3.
Fact is, this rediclulous race to come out with new cards is all useless really, if programmers would learn to optimize, code tighter, and utilize existing tools, old GF4 cards would be more than enough.. I remember when City of Heroes was being pumped up a couple years ago, the GF3 got released, and they showed new screenshots saying "UNREAL graphics, due to the power of the GF3 graphics card!".. The screenshots did look amazing, but somewhere in the transition, they got lazy, and stopped optimizing their code.
PC game developers are just lazy and in bed with card manufacturers.