We arent going to see anything like this for a while unless we get HBM2 or even HBM3. There are two reasons:
1) GDDR5/x takes a lot of room and with VRAM being a big selling point, they have to push out cards with a lot of these little dyes that are already at their limit in capacity per mm2.
2) GPUs have been marketed as bigger = better for almost 10 years. We are slowly getting out of this mindset with cards like the Nano and the X70 itx variants, but I dont see nvidia making a x80/x80ti model in an itx variant for a few more years. Your best bet is AMD where they realize that gamers are wanting smaller machines that they can take with them places (i.e. lans, moving homes, dorms, business trips, etc...)