Black market Brawlers How long?

Riot, someone please tell me how long BMB is going to last. I really hope it stays forever because it seems like a huge waste to add so much to the game and then get rid of it so it's seen maybe once a year. :/ And the only other mode we have is ARAM. . . Wait, I'm getting told there is this mode called dominion but noone plays it. So can't we just keep something nice.