If the Servers allow for such a thing to happen.. then they can work around it to put in those types of non-instanced content. Sure they can do it on this current version, however there's a "limit" on what they can and cannot do.. so if they were to put it in there with the max it could handle.. it wouldn't be satisfying if its all lagging can't see mobs, or some people around you.

Frontlines is going to be Non-instanced content. from the looks of it.. Nations defend the Frontlines to keep control of land.. sounds like non-instanced content to me.