Sorry, but Kungen streaming alone can't save the brand. Basically 9/10 dps play subpar, lots of them are failing on regular normal mode mechanics over and over again ("Don't stand in the fire/whirly thing") and i really can't see how this can be any competetive in the near future.
But i wonder why you throw out famous names from last expansions, lots of players (in general) transfered or canceled their subscriptions and a guild Y today regulary won't be the same as on their world x-th kill sometime 12+ months ago. Just wait and see, we don't know shit about the difficulties on heroic mode. Either all those 10 man guilds will plow through the content or can't compete at all and those 25 mans will stuck on an enrage timer again (like basically every tier) or overcome group compositions etc due to bigger roster.