I dunno...the objective seems pretty darn obvious to me.
HT wants a positive, fun play environment FOR THE MAXIMUM NUMBER of people. As he's said, "the most fun for the most people" is the best way to keep AH healthy.
Based on evidence he called "proprietary" (preumably including retention data, nonsubscribers' reasons for leaving, etc), he sees large arenas as unhealthy. So, we have arenas split with caps at 300 max.
Based on the obvious, games are more fun when everyone has a more or less equal chance of success. Now, when one side outnumbers the two others by a factor of 1.5 to 2, the other two sides are not getting a fair shake. That means that they dont have as much fun.
He did everything but shake his finger at us to get us to shift things around on our own, but too many people franklky didnt care about anyone but themselves (or their squad).
So now he has to enforce what good sportsmanship should have done on its own. We entirely brought this on ourselves.