I am glad with ethereum could replace of bitcoin some day later, many investor keep holding ethereum will be happy because seeing ethereum have higher price than bitcoin, but is not be true because price ethereum and bitcoin today so far and never could raised half or bitcoin price, although with eth situation today look down.
"Replace" here is not replace the price, the total supply coin of Ethereum is unlimited so to reaches the present price of Bitcoin now is impossible.
But with a large number of coins and low transaction fees, I think Eth will be used widely as cash in real life.