I think it would be interesting to see large scale wars.
First, form alliances with other clans, similar to how users can have friends in the social tab.
Second, offer your alliance clans to team up.
Third, choose your lineup. Wars are 100 v 100, or 200 v 200. There is an option you can select before sending out the challenge. The first option is NO TH11s. You can only select this only if your lineup also has no TH11s. The second option is NO TH10s. Same deal, you cannot have TH10s in your lineup. (If during battle day there is a townhall breaking lineup rule the base is automatically 3 starred for the enemy and that user loses their attack, or their attack is voided.)
Now search for war. CCs can only be filled by Leaders/Co-leaders and the troops are free.
On battle day everyone gets one attack only. Anyone not using their attack gets a 2 week ban from alliance wars.
Maybe this could be a special event available once a month so it doesn't completely replace war.

