To be clear I don't mean open world PvP. I think ZOS has spoken various times on the issues with that when they tried it in-house testing.
What I am talking about is more like an Alliance Themed Battleground or something along those lines.
Wouldn't it make sense that with People of varying Alliances traveling to different lands - that there would be various locations across these lands in which these people were fighting? Wouldn't have to be an area within a zone but rather a batteground map that is based on a zone.
Like Orsinium or Northern Elsweyr. There is an instanced location where the fight takes place but that location is not something that you merely "wander" into while exploring. I just don't see why Alliance based PvP should be restricted to only Cyrodil