> I doubt that there is any biologist who feels that the honey bee lacks the capacity to evolve resistance to varroa.

That's a bit like saying, anybody could be president. Of course, anyone could, but that gives no indication if an individual will. Evolution includes adaptation as well as extinction. The survival of no species is assured. Further, once a species comes under the purview of humankind, evolutionary pressures are subjugated, or at least diffused. Finally, we have watched the claims of "bee breeders" come and go. Many of the characteristics of domesticated breeds depend chiefly on the breeder. Once he's out of the picture, things go downhill from there. 

PLB

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