If we look at the current situation it is very unlikely Ethereum can replace bitcoin. From the popularity and price alone Ethereum has lagged far behind bitcoin.
So it took a very long time for Ethereum to be able to replace bitcoin.
By popularity, Ethereum is already very close to Bitcoin. I think that in the payment sector Ethereum is ahead of Bitcoin.
Maybe he is on a par with bitcoin, but the fact that he will be ahead of bitcoin in this I doubt, bitcoin is the first currency and will always dominate the market, and most of the investment should be in bitcoin.