Well, it seems to me that at a price below $ 5785, mining will be beneficial for many people. This has been proven by recent events, when Bitcoin was at $ 3,500 each. Of course, many miners could work at a loss, but I doubt that their number was more than 20-25%. It all depends on where electricity is bought. For example, in Ukraine, electricity costs $ 0.062 per kilowatt. And it is quite possible that in Ukraine it was mined at the cost price or even with a small income. And there are also certain discounts for the population due to which electricity can be even cheaper.
It is quite good enough to cover mining expenses and still have profits. Of what it happen to the market last year will be something a big struggle for all miners and sadly some of them stopped. As the market shows good trends today, they'll back into mining again and they are so hopefull that they can make a profit this time.