Shame but atleast better than 1GB VRAM which has been around for to long. Maybe 3GB for future?
1.5 will probably stick for a long, long time even with extended resolutions- we've probably reached a stage where asset creation that leverages such capabilities for the PC is pretty costly, coupled with the fact that the current gen consoles won't benefit much from those refinements (most devs aren't even doing it right before they start aiming for a brute force pure by the numbers solution to texturing and assets)
And I'll stick to the wager that 1GB is seriously all a gamer needs for HD. Enthusiasts, that's a different deal altogether So you'll be seeing quite some inertia from IHVs and board partners, particularly if the tradeoff of size vs bandwidth rears its head again.