Dragon Emperor

The most important new feature to add would be a decent editor like the previous version had.

If the AI behaved intelligently a strategy game could get by fine without multiplayer. However, every single player strategy game I have ever played suffers from the same AI problems. The AIs cannot react intelligently to your actions the way real people can (well, some people). For example: 1) Computers have no concept of territorial claims, and thus can provoke war by grabbing something from a strong player that a human would know not to.