It is a false premise that popularity of a deck is based entirely on the potency of its cards. The nature of a community dictates that popular decks will always exist, whether it's because of efficiency, or coolness, or the flavor of the month. Trying to force a situation into existence where many people use many different decks is simply not going to work. The way to accomplish the goal of having a versatile game with many different but equal options is to balance cards independently of community input.
By allowing the balancing to be influenced by something arbitrary like popularity, in fact the very essence of balance is lost.
Tell 1.15, 1.16, 1.17, 1.18, 1.19, 1.20, 1.21, 1.22, 1.23, 1.24, 1.25, and 1.26 this. I don't think the community, as a whole, actually minds the super popular cards receiving the simplest form of a nerf available.