"For that reason, uniting with any ‘ism’, any other movement, would be
retrograde. That is not to say that people from every ‘ism’, from every
kind of community, cannot join with the emerging movement / church /
conversation. Quite the opposite is true."

John, I could not have said it myself better.  "isms" tend to be very well-structured and defined, something folks from emergent may not necessarily like, which is why it is highly unlikely an emergent to preterISM transition is even conceivable at all. I also see a very real and tangible move from preterism to the emergent thought vis-a-vis the internal struggles we see within our movement.  Preterists are simply tired of all the theological mud-slinging coming with modern Christianity and many of us are ready to move on into the theological space which Brian introduced us to a few years ago. 

Strangely enough though, I see the thirst for community and uniting going even beyond emergent itself.  I see Christians from all kinds of backgrounds with no connection to emergent saying: I want to live in the Kingdom, live as God would want us to live.   Talk about synthesizing A Generous Orthodoxy in a sentence; therefore this need is universal as far as I can see, bigger than you and me and emergent.

So the most troubling thing I see here John is the need some see for all of us to spell out in great detail what we believe so they can put us back into a box labeled in a certain way.  If we just broke out of that box, why would we allow someone to put us right back in?