Since Brawl is a multiplayer format, any plans to bring it into Arena with the support for the format as a multiplayer (4 play option) Brawl as a singleton variant to 1 v 1 plays more like duel or who can counter who, the appeal of the format in paper is it's likeness to Commander and a deeper social mechanic that influences the game deeper than just cardpool. The roadmap currently for Arena doesn't mention this.

In the meantime, Brawl needs to be consistent and free play including the historic Brawl option for players to get more people into the format, but it seems like a tough hill to climb until the multiplay aspect is added.