Sorry for the (mostly) off-topic post but I wanted to say this somewhere and it's too long and potentially controversial (I've had enough Facebook arguments recently) for Facebook. And I know many readers of this blog are either Catholic or Anglican/Episcopal and am curious as to whether they'll agree with my speculations.
Conservative Catholics, perhaps especially in the United States, sometimes wonder why liberal Catholics who want women priests and acceptance of same-sex relationships, contraception, and remarriage after divorce don't "just" become Episcopalians, since The Episcopal Church is a liturgical, sacramental church with vestments, bishops, and cathedrals that already has these things. Of course, a few have, but most don't, and probably won't. There are many possible reasons for this, but here's one. Admittedly what follows is based on anecdotal impressions rather than hard evidence, but I think that despite superficial agreement on sex & gender issues, when it comes to worship liberal Catholics and liberal Episcopalians do not actually want the same things.
I think it's fair to say that many (perhaps even most) liberal Episcopalians, while firmly committed to both women's ordination (which despite a few reactionary holdouts like me is no longer even considered controversial) and gay rights, have no problem with, or even enthusiastically embrace, most or all of the following: priests celebrating "Ad Orientem" facing the altar, Kneeling for Communion at a rail, Incense, Latin, Gregorian Chant, "Elizabethan" English, Music ministries that emphasize sacred works by prestigious (mostly long-deceased) European composers sung by a professional or semi-professional Choir, the Pipe Organ as the church's principal (or even only) musical instrument, preference for traditional Architecture and care for historic buildings, a generally Dignified and Reverent "Sunday Best" approach to worship that avoids emotional exuberance, and (here we get back on topic) a certain Downton-Abbey-watching nostalgic fondness for England and the British Monarchy. In contrast, Progressive Catholics are likely to object to some or all of those things. Additionally, even if they've discarded the conservative moral views of their Irish ancestors, many American Catholics are likely to retain a chip on the shoulder regarding anything perceived as "elitist," "English," or "WASPy," while simultaneously romanticizing the idea of being in communion with a billion mostly non-white and non-wealthy people around the world. I should say that the "traditionalist" aspects of Episcopalianism I've identified--all of them dear to my heart--are far from unchallenged or universal within The Episcopal Church, but they do survive, perhaps even more in perception than in reality.
Therefore, most Call To Action, National Catholic Reporter, Hans-Küng-admiring types would not be comfortable in The Episcopal Church, and that--and not just a revolutionary desire to change the Church they were brought up in, though that surely exists as well--is why they don't join it. Of course, all this also works in reverse: the surviving traditional attributes of Episcopalianism I mentioned have also probably been a major factor in discouraging conservative Episcopalians not thrilled with certain contemporary developments from leaving to join the Roman Catholic Church.