I think it could be an opportunity for the Devs to implement an economic system based on the overall players' behaviour.
For example, each of the four factions (Pact, Dominion, Covenant and Cyrodiil) could have its own currency. Exchange rates could be determined by how well the faction behaves from an economic point of view.
It would open very interesting roleplaying options, e.g. allow for trader character, or diplomatic quests aiming at sealing trade agreements. Or quest aiming at destroying or stealing supplies of some goods, or at burning some mill, in order to raise prices or ruin a local economy. (I think Todd Howard mentioned something like this during the development of Skyrim.)
I know I don't tell much in this, but I haven't much thought to it yet. What do you think about it? What are your ideas around this topic ?