Take a look at this > https://www.marketwatch.com/story/heres-how-much-it-costs-to-mine-a-single-bitcoin-in-your-country-2018-03-06 . As you can see (taking out the extremes), the cost of mining for 1BTC is 4-6K $, which means going much lower that 5K shouldn't be possible or most will stop mining.