I don't personally think, that Runewars would benefit from more politics. It's way better IMO to have 2 different games - TI3, in which more diplomacy and allies is needed in order to play well, and Runewars focusing more on "solo"play. After playin' only a few 4 - player games, I was already unhappy with little interaction between some of players.
It's good to implement some interesting ideas and solutins from other games, but it's also very important to maintain sense of diversity between games. Not only with theme (high fantasy vs s-f), and some other solutions (every one has his own set of orders, drawing fate cards, quicker, yet still epic game and so on). It's especially important for me, as my wife doesn't like diplomacy and prefers more straight - forward aproach of gatherig resources and defeating the enemies. Of course, one could argue - not bring the 5th/6th player than, but - why should I pay for an expansion, that i WOULDN'T USE IN HALF?