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He's only comparing January figures. There could be a lot of variables at play, including the lack of new, interesting, mirrorless cameras to excite enthusiasts. It could also depend on the market, since it seems North America is still slow to catch on with mirrorless. I agree with his point that Olympus, Panasonic and to some extent, Sony, have poor representation in major big-box store chains here.
From the general consumer point of view, when a camera like the new Canon 'mini' Rebel is about the same size as a mirrorless camera, and the lenses for many mirrorless cameras are not considerably smaller than those for APS-C DSLRs, there is little compelling reason to choose mirrorless over DSLR, especially if it's also a matter of brand recognition.
I also agree with Jeff about mirrorless pricing being a bit on the high side. If I was in the market, I'd probably opt for something like a NEX-6 with the 16-50, but that's $1,000 vs. $750 or less for a DSLR kit. I think a lot of people shop with price as the most, or one of the two or three most important criteria.