There will be only 4 groups.

And if you read my post above you will get the whole idea, but I will explain it one more time, regarding your clan.

You are active clan. You do clan wars, you rank up. At some moment you ranked up enough to move up the group. Lets say from D to C. Other active clans that clanwar alot will go there aswell. But from now on you ( active clans ) will fight one each other, instead of new clans from D.

Basicly, you would not be able to farm clan points on new clans over and over, but you will had to fight strong active clans just like your own in order to rank up.

any questions?