No, I don't think anyone's marketed a pure OpenFlow switch yet. Joseph Tardo of Broadcom put it well, during his talk at this panel session -- he basically said a pure OpenFlow switch would be a great way to go out of business fast. :)
And the reason is basically what you stated -- OpenFlow is being considered as a keen feature for corners of the network, not something you'd devote a whole network to. Now, as OpenFlow islands grow larger, that might change.
"Hybrid" OpenFlow switches will be prevalent for a while, because vendors already have, and customers still expect, support for at least some of the standard L2/L3 protocols out of the box. For now, most customers see OpenFlow as an additional feature that can make a switch platform more future-proof. Or has anyone announced a switching (as opposed to control-plane only) product that does *only* OpenFlow?
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