War exhaustion makes people vote for pacifism

In several game and in reality (I guess) people want peace when they are exhausted by everlasting wars. 

It could be more realistic to create a war exhaustion system which makes people vote for pacifists.

It would then be interesting to add a greater penalty (happiness and troops/fleet efficiency?) when you are at war while your senate is governed by a pacifist leader.

That is a part of the solution of the political system's having only a little influence on the gameplay (whereas it is great !)

I'll precise my idea in the comments