Well, I see it a little more positive right now. We need another 130 PH/s to raise the difficulty up by 10% -> or in other numbers thats like 27196 of new S7's (worth $15.3 million without shipping) on the net.
I wonder what´s the total investment in bitcoin mining. Must be in the hundreds of millions of dollars. Miners plus facilities and manpower. Maybe billions. Some of it must be pretty squeezed by now what with the big difficulty increases since last year. Investments usually mean debts.