Yes, this will give little power and life to the concept of clan and clan wars as well. In one of my earlier threads i too suggested this one, but pinnapple's idea is much better than that.
Clan credits is also a better idea as compared to mine.
But one drawback for all the above posted ideas would be the complexity in the game. Currently the game is very simple, even illiterate could understand the concept easily/ or after little experience. But after implementing your suggested ideas it would be adding many factors in the game, that would make the game much more complex.
So i think there should be some other but still similar plan that should be introduced. And i hope pinapple could counter this problem as well.