Ethereum does have a tremendous chance of becoming more than now, maybe the next 1 or 2 years, the price of ethereum will increase considerably from now, but to replace bitcoin, I think it's impossible, because Bitcoin is the benchmark for all crypto currencies there, and Bitcoin I think is more in the know and with a very limited supply
what you convey is true even though we cannot know exactly what and how the price will be in the future cryptocurrencies and that in particular requires confidence and patience large enough to invest in cryptocurrencies with whatever coins it is