Ehh... that's SORT of true. The real prohibitive factor is cost. A 240 GB SAS SSD is twice the price of a 1 TB SAS HDD. However, if you look at companies like Simplivity, who are creating insane turnkey storage systems in a 2U form factor, you're going to see a massive effort to force the old-hand HDD adherents like EMC and Dell to go more toward SSD for speed.
You have to have a massive enterprise budget to afford an EMC disk shelf with SSDs. Hell, even tier 1 storage is around $15/Gb, and that's usually spinning disk with large amounts of cache. Using SSDs in the enterprise is best for virtualization, IMO. Fast provisioning, fast boot, and you don't have a disk bottleneck when you're running on a UCS chassis or an HP BladeCenter.
I've spent over 7 figures on SLC mostly over the last three years and my payback numbers are very, very, very, very, very good. The cost of servers on the rack in the data center seriously adds up, and when that server can't handle the workload because disk throughput is slooooow, it's not paying for itself.