just my 2 cents. sure glad i sold at $11 :-)
No. The difficulty adjustment will ensure that some miners can make a profit at nearly any price. Lower prices drive miners out, difficulty ramps down, mining becomes profitable for miners remaining, more miners jump in, difficulty rises, mining becomes unprofitable, miners leave. It's a balancing feedback loop that is always in play, it makes no difference what the price is. I have no frigging clue why after a year of this we still have people insisting that the "cost of mining" somehow affects the price of bitcoins.
There is a minimum cost of running a mining rig which doesn't linearly scale with the difficulty factor.