Multi displays are getting very popular and games need a lot more VRAM than 2 years ago. Many games run way better with 2GB vram duo to their extreme texture size and amount.
AMD and Nvidia always build their cards a little ahead of time, when 512MB was the standard for games, all modern cards already had 1GB Vram and we also saw the first 2GB cards.
So I wouldn't be so pessimistic about the VRAM size
