Promises, promises... these kinds of designs have been on the drawing board for years. SDXC chips are going to cycle to 1tb in the next 2 -3 years. BTW, you know 200mm is almost 8 inches in length, right? That's only viable for SSD drives, not hot-swap flash chips. Plenty of SSD companies are fighting to get the cost of those down to a closer ratio that HDD cost.
Call me when they get 1tb micro sdxc 200x (the sdxc 1 spec) cards for $60, then we'll talk..