I think that honestly the fact that OHKO's are banned is kinda stupid in the first place. One, it's in the game. Second, they've never been breaking and in fact enhance non-Bliss/Cress stall teams (knocking out Blissey is a big plus IMO). Third, I'm not really a fan of banning things unless absolutely necessary. It's on the players to adjust to the meta: Not on the meta to adjust to the player. If something comes out so horribly broken (like no Sleep Clause Poison Heal Breloom for example, Dark Void Darkrai, or the Soul Dew Lati@s), it will be taken care of. Bans are kind of a last resort thing: If something gets really out of control, or like 70% usage like Garchomp in Gen 4 pre-Platinum or Mewtwo from R/B/Y.
Just because something is "undesirable" doesn't mean it should be banned. Hell, I'm probably one of the few that think that the uber game should be the standard game and Glitchmons should be the usual street Pokemon game.
Just my 2C on this.