What are you basing this on?
The direction of Showdown started long before anyone anyone knew Keplar would be relatively weak on the Compute side of things. There is nothing that was "designed" to hobble Keplar with Showdown, at least not from our part, not least because we simply didn't know what Keplar was or where it would be weak when Showdown work was being done.
DirectCompute is already being used by lots of titles and devs will adopt it more and more as new algorithms are developed using it. Likewise, when we initially demo'ed forward plus with Leo it garnered a lot of
developer interested and experimentation because it is a rendering technique that has the efficiencies of Defferred Shading without some of the limitations.