Not open at all if the idea means messing with how things work on another server just because of Blackrock, personally.
Lose face? I've openly said since 2015 that Blackrock should be closed so we have no custom servers.
The "pro" we are after and deliver is recreating the mechanics as they used to be in the original game. That's what people who go play on Lordaeron or Icecrown came here for, and suggesting that after all these years how Arenas work should be changed on those servers only because Blackrock has too few players to make teams is absurd.