This point of view is nice and I liked the idea. Here's an idea I can share;...
In Travian generally, if a player tries to focus on anything except military; then he/she has not much chance to survive too long. This can change.
A player may chose to improve his/her game on producing and focusing on resources rather than military progressions. Now, the king can have the ability to protect the player in terms of military. The producing player must pay taxes to the king in return. This is an example. No one can be the best at everything but everyone can mutually share the improved skill.
Thanks and regards,