I don't want to be a downer either, but "a man's got to know his limitations." If anyone who isn't selling (and therefore marketing) pomegranates could document a history of growing them in Z6 (or worse), I'd probably jump on the bandwagon just as I have with figs. Even a requirement for a modest amount of protection would be OK.
But I wouldn't want to invest 5 years without fruit then see the plant destroyed by a random -10 F weekend. Meanwhile, I'll focus effort on the species that will reliably produce tons of fruit with modest effort -- e.g., raspberries, peaches, and of course figs.