Thanks for this. I currently fall into the category of dual rig miner, working ETH. If this artificially induced difficulty bomb continues, I too will be leaving for ZEC or the like. My ability to mine ETH has been cut by nearly one entire coin per month in the last 3 weeks. I would really like to see the difficulty bomb disabled, but if it doesn't change very soon, I will be looking elsewhere.
RE: BBT Carter post on EIP #649 - Eth Difficulty Bomb and Reduction of Block Rewards