A LOT of clans are not playing any of the tournaments because it must be organised "outside" the game and it takes time, you need some1 here always checking, you have to call your clan members at x hour at x day to play, you must to be careful what you're doing because you have to make everything by your own.
In fact, what you can see in all the tournaments, is that there are always the same teams. Same clans.
Adding an INGAME battle mode, and take out the coop thing maybe, will give all clans (even small clans) the way to play and give a real sense to REGIMENTS.
But...as I can see, since nobody is asking this, and since i get this answer you gave me since 2017... i know will have to wait other 10 15 years from now to see something like that.
I always asked this because the best thing this game have to offer (on pc) are this team battles. looks like nobody cares about this so...nevermind.