if stamp breaks into the 3xx - we are screwed
i call bottom at 392...
The bottom is calculated long ago, browse around. It's the price it costs to mine BTC with electricity cost that most miners pay, currently somewhere around $280.
Mining costs do not drive BTC price, BTC price drives mining costs.
This is true in majority of cases where BTC price is not close to mining costs. When the price collides with mining costs, BTC price can not go below so it interferes with the mining process lowering difficulty as unprofitable miners are turned off.