You guys all bring up interesting points. I would be more concerned if a government, any sovereign nation's government decided to make a coordinated effort in mining. Then in the end, if they wanted to corner the BTC market, they could figure out the best way to do that to meet their agenda.
We all live in interesting times everybody.
Well luckily over half the coins are already mined and difficulty keeps the supply controlled regardless of how much hashing power is thrown at it.