Now the price of dash is bound to rise so keep hold of your coins and wait for the 400 $ Mark for the dash as more and more D3 will be online in Nov and diff will spike once more and the profitability will be negative
I suspect this is true but it is not guaranteed.
Miners who paid too much for these devices and can afford to hold the coins will not sell at these prices and that will put upward pressure on the price.
Or... People who really put in too much money to buy a ton of these will dump to just try and recover anything they possibly can and that will keep prices down.