In mid-2008 (early 2009), one of the major hardware vendors (IBM, Dell, Sun, etc) will ship a blade server with all SSD.
The key will be that the blade itself will be a LOT smaller (by about 20-30%) since power consumption and dissipation is reduced. They’re also going to take advantage of the low form factor of SSD to fit more disks per box. Probably in the 4-8 disk range.
The system itself will have less memory than conventional systems since SSD is so fast.
This is going to further dampen the 1U form factor.
These boxes might also be half depth (ALA Rackable) to allow back to back mounting.