So even if a miner is hardcore Bitcoiner, they won't be able to mine if power costs raises and no price increase. we have a couple of months before the halving event. We may see price hikes after the halving event. Before the event, miners still get 6.25 per block and profitability will remain the same as phill described. But, let's say the halving event split the block reward but the BTC price did not double, the profitability may split as well. The question is, how many miners will continue mining without profit? After all, everyone is looking for profit.