Not unless for 100$ or so I can get 4TB of very fast Raptor like HDD.
SSD's or whatever comes after. SSD's are getting cheap and cheaper as I said earlier.
By 2014, supposedly when the price per GB will go back down again on HDD's, SSD's will have become way cheaper.
By then you'll most likely be able to get a 1TB SSD for 150$ ~ or so.
Super fast rar'ing, instant load times, crazy fast boot, Microsoft is promising 2 second boot times with a SSD on Windows 8 & Higher(Unlikely, but they claim it.)
No need to defrag, no file corruption...
No need for HDD's by the time prices become reasonable.