Relic's continuing revenue for the game is driven by reoccurring dlc (the merits of which can be discussed elsewhere). This reliance requires a large active and happy community. My understanding (again without data) is that team games are the most popular form of consumption of the game. If this is true It makes sense in my mind to carter to the majority if it is relied on for continuing support for further revenue streams.
Catering to the massive could be achieved in one of two ways. The first approach could be to change the focus of balance to team games forcing players to cooperate more closely to achieve victory and improving the satisfaction of the team experience, this may require a massive think of the game approach. This unlikely to happen due to an ingrained tradition that 1v1 should be the primary concern of RTS. Relic has always been a company to do new and exciting things which make them their games so attractive. My hope there would be some thinking outside the RTS box when it came to team games, make cooperation core to the game.
The second approach is to allow the community to do it's own balancing through mod support and the Steamwork shop. The team balance mod could be sold on the workshop to Relic's benefit and also support the modders. In this case there must be strong support by Relic by allowing mods to search through auto match system. Only allowing custom games to support modding would undermine players will to look for games.
Super post with considering suggestions. Suppose 3 vs 3 , 4 vs 4 were excluded from the Coh2 in this case the player base would reduce to 2000-3000 players and would never rise again.
Dev Team - listen to the community !!! There has been a very unhealthy situation around the game !