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.
Yes,I'll agree with you that the two giants in crypto currencies are no sign to rise back again.As of this moment,if we have enough money to invest its our opportunity to buy any coins that we wanted and hold it maybw it can be profitable by starting next year.