This is just an Idea. Why not have a seperate townhall or like "Guild Castle" where anyone in the clan contributes resources and that Guild Castle is built from that resources complete with clan upgrades, research tech and defenses. So we will have it in war and the best clan will be those with active members who contribute to this castle. It will also be a good and hard target in war. Also attacking this castle will not regenerate because it will be more defensive and powerful than normal th so team effort and strategy will be in play and if possible the clan can attack simultaneously.
Another idea is clan alliance and clan war revenge. Alliance can also contribute to the castle and have alliance war. The clan war revenge is to have payback to the clan you lost at war. It will also be a good idea to have clan wars tournament with prices of gems to keep the community alive and competetive.

