I completely disagree on your definition of poly. Swinging and Poly are both forms of non-monogamous relationships. In one the emphasis is on sex, and the other the emphasis is on love. But if this is just a terms issue, it seems like it should all clear up quickly.
You seem to be predisposed to believe that those studies will come without any evidence to indicate the supposition will be the case other than your perspective view into personal anecdotes. Like, "that's weird, yo". I mean, I guess I'd grant the idea that stigma must first be removed, but I don't grant the idea that the lack of stigma will change the outcome of the study.