But for what hashrates?
I will bet you 2:1 that the difficulty will be less then you stated in the following url:
http://i.imgur.com/6zjexjt.png
Tough bet to make considering next year hash rate will likely closely track BTC price. What happens if BTC is at $1kUSD each and rising. Difficulty will likely overshoot cost based target estimates anyways because of delivery delays and because prospective miners see a rising exchange rate and extrapolate that into their purchasing decisions.