@Teoh Han Hui
There talking about hitting the wall of 1TB per sq in around 2014-2015, which is around 4 to 5 years, because they will be late ;p
It is only around that point that they will start moving beyond 1TB per sq in, so that will be 'around' 2015-2016, and you can bet with the new process the costs per unit will be quite staggering at the beginning.
I can imagine that very large data centres will be crying out for these massive density drives, and as I know I am already exponentially using more storage space on my own home PC. However for me, I would quite happily buy a power efficient massive storage drive in the full hight 5.25" size for bulk storage and pay less and use SDD's as my primary drives.
For most people I suspect the increasing size of SDD (which currently seems to be increasing faster than HDDs) will reach a point and cost where SDD's will become common for 'basic' computers, at that point your volume sales which would allow you to reduce the cost per unit might not be sufficient in the mass market, leaving 'mid sized' drives or RAID (which is surprisingly common on retail PC's) using a few 'small' SSD's are a better more cost effective method.
Which ever happens I will of course be happy, after all, more space/speed and lower power consumption are all good as far as I am concerned regardless of which technology gets me there first.
On a side note, most SSD's seem to be 2.5" in configuration, I have no problem with 3.5" sizes if it means I can get more storage per drive with out significant increase in cost.
I also note that 960Gb SDD's in 2.5" form factors are now around (albeit at £X,000), it does not feel all that long ago I was stunned by the 4Gb EeePC, and you could'nt get an SSD above 16Gb for love nor money. It feels like in the same time HDD's @3.5" have only gone from around 750Gb's to 2Tb's. More importantly, SDD's with there lower price (for the smaller ones anyway) are beginning to sell in larger numbers, which can only be good as far as price is concerned.
Anyway, all hail the future!!