But hard drives keep getting bigger and cheaper, too. 750GB SATA's are only a few hundred dollars. By the end of next year 2 Terabyte arrays will probably be in the neighborhood of $500. And 500GB laptop disks won't be far behind. I think solid state memory will continue to be much more costly than disk storage for quite some time to come. So it'll be used where power consumption is key, and disks still used in most other scenarios.
Do you NEED that much in a laptop? Well, it wasn't too long ago we thought 640MB of RAM was plenty.
"Rotating" hard drives are not getting bigger or cheaper at the same rate as the solid state ones. SS drives also have the advantage of being *much* faster -- we did some tests with the database at work (state library in Denmark), and the difference in speed on database queries was about an order of magnitude. While rotating hard drives can still hold their own in sustained throughput, typical usage is much more scattered, and the seektime (in *milliseconds*) is killing them. SS is the wave of the future, and was so even before these recent breakthroughs.
Power consumption and concomitant cooling are major costs in data centers these days. Being able to pay more upfront to get faster and less power-consuming storage is very appealing. Not to mention the lack of mechanical parts. If I had money to invest right now, SS drive manufacturers would be high on my list (modulo the recent SanDisk lawsuit).