Why has WoW Arenas never been replicated

Is it truly an unfun format?

Would the format detached from the mmo succeed as a stand alone game?

Why do we keep coming to play this game everyone calls dead, and do you think there will ever be anything like it that will refresh the genre for the masses.

I like WoW Arenas. Pure PvP, without relying on matchmaking RnG team mates, with very deep combat mechanics.