People, you need to look at current technology and stop assuming a doubling of memory will just come out of vapor somewhere.
The ONLY possibility I can come up with is Samsung's new 20nm process sizes down the chips enough so that they can fit 2 chips in....but that's really streching. It probably won't cut the size in half.
Toshiba announces 64 GB NAND packages
Look, I double the memory right out of vapor!