They will need to sell at whatever price to recoup part of their investment.
That's a common fallacy that people bought into 3-4 years ago with Bitcoin. People don't mine for the price today. They mine for the price 5 years from now.
Then wouldn't they be best just buying the coinage rather then the equipment
If they buy their equipment now and there is a bubble a few months from now, that equipment might be wildly profitable and in demand.
I think that's what miners are hoping for.
Wouldn't it be easier to use the same money to buy coin directly if they are expecting a bubble?