It will be very difficult to dump the market further(it is possible, but it will be very difficult and dangerous), because the miners are already working at a loss on some coins, like ethereum. Bitcoin almost fell to mining cost price, so, i think, it worth to start to buy now.
Miners are really having a difficult time right now. The resources are limited and almost all of the resources are mined. Their profit isnt supporting them anymore thats why they chose to quit mining. But yes, we should be buying coins now that the market is on deep. Its a great opportunity though.