Nothing has changed.
GPUs are 1) targeted at very specialised worlloads 2) optimised for highly parallel work and 3) proprietary hardware.
In contrast 1) SAS processes are varied, 2) mostly single-threaded, and 3) SAS is portable across different platforms (just four really these days: AMD-64, IBM's Power Architecture, HP's PA-RISC, and IBM's mainframes).
Furthermore, the bottleneck in SAS processes is seldom the CPU (though that is changing as the speed of CPUs doesn't increase very much nowadays, while storage speeds are leaping ahead).
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