This is where i think Blizzard just needs to say fuck it. Top guilds like Method will always do whatever it takes to get that advantage, there is no competing with that unless you are top 20 at least. To force the rest of the game to be neutered to support the sub 5% of players is what is causing this problem of nothing being rewarding and world content not getting any worthwhile updates. While i can sympathize with not wanting to let your guildmates down, there is no such thing as competition when you are not in the top tier.
They need to focus on the world, make it fun regardless of the cost to the fringe players. Hell segregate PVP and Raids so that their gear and shit only works in those instances and vice versa, then there can be no "forcing" because you don't have to touch the Overworld to be competitive. That said it means you wouldnt be overpowered in the Overworld for being a Mythic raider either.