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.
Little depends on mining. Many large pools can mine at a loss for various reasons. I think it's all about manipulation. And they will continue. The market may falling for a very long time. It is quite possible that next year we will have the same bloody tears as in this ... But nevertheless, I think that now is a good time to start investing.