6920 then 5200 then 6500 then capitulation around 3K in january 2019
With this difficulty there's close to 0% chance for ever getting back to $3000. Yes, electricity prices * difficulty are not directly correlated to BTC price, obviously, but no miner can afford to subsidize electricity costs to BTC network. You can not operate with a long terms loss, they will simply:
a) turn off the machines, or
b) stop dumping immediately what has being mined, making permanent bottom on break-even price level.
Guess which one is more likely to happen.