If the feature is too complicated to be included in the single player games, I would quite strongly advise against hoping for it in TESO, which frankly does not look like it will be innovating in any serious way.

What would happen if we need to face each other from different factions. Let's say that the Daggerfall covenant and the Ebonheart pact need to fight against each other and players would need to take part in this in some way. Would we then kill each other or not attacking.

We recite poetry until the other side zero-sums.

Or...betrayal.

Now just say that drunk and high as the Elk. With 15th century verbiage.

You'll fit right in, trust me.

We wait until someone mantles Ebonarm and ceases the fight....

...or Pelinal Whitestrake. Whichever comes first.