Initially yes, but then the difficulty would adjust and some would be able to come back on. It's not quite that cut and dry now though as there is a robust futures/options market that miners can use to hedge, which would allow them to continue operating in the red for a period of time. Similar to the way oil producers and farmers can whether price shocks via futures markets. That being said, that $6k number is the lowest I think we will go from here. I'm thinking $7.5k looks like a very good support level should we get there...