According to a recent presentation by Seagate's Alvin
Cox, who is also chairman of the Joint Electron Device
Engineering Council (JEDEC), the period of time that data
will be retained on an SSD is halved for every 5 degrees
Celsius (9 degrees Fahrenheit) rise in temperature in the
area where the SSD is stored.
In the "early" days of SSD's they didn't offered that much better performance especially in the enterprise storage arena than highend SAS/FC drives.
Both with improvements in controllers, the development of dedicated protocols for SSD drives and the usage of a cheaper alternatives to FC in the form of PCIexpress coupled with ever increasing storage density even in the enterprise market SSD's are pretty much setup to take the entire storage market.
In consumer grade computing you only see mechanical disks in entry level notebooks ("SSHD's usually with 16-32GB of SSD storage for OS and Cache"), for for home network attached storage. 1TB consumer SSD's already can be bought under the 400$ mark, and the closest mechanical drives with the same capacity in terms of performance (still quite below the SSD) which are the "professional grade" 10-15K RPM drives cost about the same. It's probably just a question of 2-3 years before mechanical drives will be almost completely written off the market, they already don't make much sense for enterprise storage since they provide a cheaper alternative to high performance storage even before you count the savings on electricity and cooling, and soon they wont make sense for everyday consumers either.