Is that the fully configured price or is it just the miners + power supplies? Is there a breakdown of wholesale cost of mining hardware anywhere?
A 1 terahash/1 KW rig with 0.02 power (which i do not believe exists anywhere) between today and 5/23/2015 will produce $1,080 of BTC @ $600, 16%, 12 days per bump. At 850 Watts, it produces $1,100 worth of BTC.
I don't see the business case for large new farms to go into production with new capital investment with current efficiency. I can see already committed capital investment being put into production. I don't see the business case for a new generation of chips unless they can achieve an order of magnitude improvement in power.
Then labor costs come into play. A one petahash farm at 850W/THS and 0.02 power burns $12K in power per month. That is roughly 1000 servers. Even if labor to service that is only $3,000 - it decreases the time to go negative.