Indeed many prospective coins are predicted to replace the BTC sometime in the future.
ETH has complete requirements to replace BTC.
according to BTC predictions may be exhausted by 2020.
From my knowledge Ethereum will be the second coin next to the bitcoin having very huge potential.Now the price of Ethereum is only of 1000$,soon it will raise back as like a bitcoin.The next peak which will be achieved by ethereum is 3000$.Now the price of Ethereum is seems low.Try of Ethereum.