I don’t know. Seing requirements for games rise upwards(and using more VRam) it might not be a problem NOW but maybe in 2 years? And when you buy a new GPU you’re usually not calculating for just 2 years (without a very specific reason).
For example my gtx580 still performs quite well, but has only 1.5GB of VRam. Most games start to scratch the 2GB barrier for mid-settings and as a result of not enough VRam i sometimes need to scale down. (From measuring the GPU doesn’t seems to be at 100% for all of those games, so the VRam seems to be the bottleneck) That was a mistake i did in the past, not looking if there was a better one(and there was a 2GB version!). SO for my next card(and i looked for the 970GTX) i am looking for as much VRam as possible to avoid future bottlenecks by . And it sounded quite well to have a GPU at price tag with such a good performance and 4GB of VRam. But seems to be something that’ll get more noticeable in the (more or less) near future. and i don’t want to be blocked by not enough VRam again. SO 970GTX is currently out, and i am waiting for the next Cards.