Ok, I mean, let's be real here for a second. Equating Auctioneer and Frostbolt is a pretty big... well, not sure what to call it -- chasm, maybe? It's true hat both are staple cards; one in mage and one in rogue. One, however, enables an archetype single handedly. The other does 3 damage and freezes a target for 2 mana. If frostbolt suddenly disappeared the only thing that might happen is that mages might finally use flame surge for a bit. There's a reason why whenever Ben Brode gets talking about what kind of cards he might like to see removed from standard he talks about cards like Auctioneer, Ice Block and Alextrasa. We are talking about one of the most influential cards in the game here.
Regardless, I'm not actually arguing against the merits of Auctioneer and by extension Miracle Rogue here. I'm just pointing out that, GA has been on their radar for a while now and if I were a betting man I'd bet that it gets retired at the end this rotation. It has nothing to do with skill or if Miracle is a great deck with a high skill cap (for the record, I agree with both of those claims). It is my read that Blizzard just believes that it's time for a change.
One theory that I could see Blizzard buying that the relative ubiquitousness of Miracle Rogue stifles experimentation. For example, rogue still has a pretty decent jade package going on, but the deck never really caught on and was never really refined as a result. Was jade rogue a t1 deck? Probably not. But I could totally see Ben Brode and co reasoning that the deck never really had a chance.
