Why stop at two?

The battle cry for those who started the Current Unpleasantness in The Episcopal Church (tm) seems to be "Full Inclusion!" OK. So what will they say when folks in this kind of arrangement want to be "fully included"? I mean, it's clearly in the Bible. And what about our Baptismal Covenant? Wouldn't that "dignity of every human being" thing we hear so much about these days apply here, too?