Bitcoin, as well as the whole market, fell to its critical levels last month, but none of the major investors attacked the cryptocurrency as a prey. Perhaps these coins like bitcoin and ether just overrated.
They were overestimated a year ago, now the prices are more or less real. I think ETH cost nearly $100 and BTC - nearly $3k, so the rate is nice now and it might make x2-x4 in the coming year. It's a quite good growth!