One thing to remember in reading all the pro-mining posts is that most posters have a vested interest, that is, they will be better off if mining continues to be profitable. This isn't to say they are being deceptive - just that nobody likes to believe the gravy train they are riding will stop.
It would be in a miner's best interest to deny profitability because any additional computing power added to the network decreases the bitcoin income of the existing miner.