I find it strange that "size" is the factor and it's not even half-size. It's not like I could mount two of these in the space of one 'normal' one, so why bother? Oh, I know - new, thinner netbook-tablets, yada yada. I'll wait to meet a Surface or Tablet user that actually watches their 2Tb of carried-around video files. That's all they can do - they sure can't use the device for something OTHER than 'watching'. "I can dance with it on picnic tables!!" Yeah. Riiiight.
Deliver these in one-third-the-height and a larger capacity, THEN intro us to the possibilities of a 3-stack connector array.
"Capacity" I think is the real push forward, not size of housing. (Although I'd be impressed with a 12Tb smart phone...)