With the currently available hardware, there is no possible way difficulty adjustments could be 20% for 6 months. At that rate, even BitFury, MegabigPower, and CoinTerra would not be able to operate their gear at a profit.
Sure it could. It's quite possible that enough people have Bitcoin mining gear on order, or ASICs in fab, for that to happen. Until we hear that ASIC vendors are shutting down production, the difficulty is going to continue to increase rapidly.