You can do that right now in open. Most of my emergent content is not combat based, or at least was until the griefers showed up. It's all in the communication. Sometimes things start out as combat based but switch to co-op play through the encounter. That's why open is fun, you never know what will happen.
Ah but then the lone wolves who want emergent online content are at a disadvantage even more? It's all about "who" you know? But I see your point the camaraderie amongst the PvPs does seem to be rather excellent and can lead to a better overall expereince in open.