I doubt that there will be 10TB snap-in memory modules very soon.
Considering that flash RAM cell dimensions are shrinking by a factor of two each year (meaning four times the storage on the same chip), that may come sooner than you think. Today 16GB flash drives are at roughly the same price point as 500 GB hard drives. In 2010, or 3 years time, those same physical size drives should have a factor of 64 increase in capacity, or roughly 1 TB, for the same cost. Granted, mechanical hard disks will probably be up to perhaps 1.5 or 2 TB for the same cost, but that's still only a slight edge. 2 years further down the road and you have your 10 TB memory modules. So not right now, but perhaps 2012 or so.
Funny but I think mechanical hard disks will go obsolete at roughly the same time as incandescent lamps. Speaking of obsolescence, has anyone noticed that CRT monitors are competely out of the picture (Newegg has 5 models left, probably just leftover stock, compared to 300+ LCDs), while CRT TVs are practically gone?