You should consider the possibility of an increase in BTC price. When the halving occurs its reasonable to assume the price may go up. Large miners sell their BTC because they have to pay the bills in USD. With less BTC to sell the price could rise. I say might because there is a lot of FUD and market manipulation that will take place so who knows what actually happens. But should the price rise it will improve profitability and allow many older miners to keep running.