Normally i would say: If it has been proven in the lobby, it can be added to the ranked queue. To me it looks like it is not very popular in the lobby.
But EW is something special. The redbull tournaments show that there is some kind of market for these games. Also the devs think there is some market for these games, because they have decided to include EW in Quick play. The current design of quick play is terrible. Therefore i also suggested to add EW (and maybe even Battle royale too) to the ranked queue and just delete quick play from the game.
This is my own thread about this subject.