As I believe Ethereum is the cryptocurrency that can once replace Bitcoin. I do not know when it will happen - the bets that I can do are as follows: in 5-7 years ETH will be the leader in the market. IMHO.
I can not even imagine that such a thing would happen that the price of bitcoin should fall to $ 1, but then the price of ethereum would be 0.0000 ... Do you understand what I mean?
I see the development of projects just ahead.