Well, for example, the fact that there are three main factions seems to me to be there to be a simplification of Tamriel's complexity to account for the limitations of the MMOs. Why not, rather, create many factions, allegiance, neither of which would be monolithic, as they'd know internal rivalry, divergences of opinions. Then, in all those factions, they could have drawn a network of possible allegiances. It would have provided something HUGE if the politics and diplomacy were implemented to high levels of complexity. For what we know right now... well, Any collaboration between Haafingar and the Bretons seems impossible, and all faction desire the same objective : the imperial throne. If the objective of the various factions was less clear, and if they could forge changing, original allegiances, if one could betray and help, infiltrate other factions, and so on, this would more reflect the level of complexity I expect from a TES game. Also, coherence and plausibility with respect to existing lore should be the main, very important guidelines. But well, maybe they are. So far, we don't know enough from the game to judge it. I surely hope that the game will be great, it'd be foolish to hope it'll fail. But the announcement hasn't managed to get me excited so far.