Maybe what we can do is follow some sort of "Code of Honor", I am referring to all pre-mades.
I was in a game with Honolos and Condition, they looked at the teams on both sides and decided to sit out.
When alliance started winning with 3 nodes vs horde's 2, they started playing, got a node and didn't do much, and helped horde win at the end.
Maybe guild leaders of big guilds on both sides (especially alliance) can ask their members do something similar.
Having mostly polarised games will make the bracket die, we need to work together to make the bracket more healthy and less toxic