This all comes back to lobbies. Let the 733t have their automatch and let the rest of us have our custom games.
I like the idea, but I see a bumper....
First, by removing them from ladder games, you erode the business model or the target group for the commanders. That hurts.
Then, once that step would be taken, there comes the understandable call: Hey, can we plz have lobby games without DLC commanders?
I guess you really have to balance them (doubt it) or remove them (more doubt).
But once you ever entered that path, down the DLC commander path, is there a way back? I would love to see an answer to that that suits players and short term profits.