Ethereum's value has remain stable amidst consistent downward pressure in crypto currencies. So, it does seem to have better value proposition for investors and with so many projects being launched on Ethereum, it will always be in demand. However, on the question of whether it will replace Bitcoin as number 1 crypto, I do not think it will rise to that level. Ethereum's strength is the ecosystem that it provides to projects based on blockchain and if Ethers value rises to the level of BTC, the funds would dry up and so would the projects. So, Ether will always be a second best Crypto though much more credible and usable than BTC.