Overthrow bitcoin? Don't think so mate. I would agree that Ethereum have attracted a lot of investors specially some good news after their meeting last week but I have doubts that its has enough push to take the #1 position from Bitcoin. And they are built differently. Bitcoin was design as a P2P money transfer, micro payment menthod and Ethereum has smart contract platform. Two different coins with two different purpose. And if we can go back around May-June, Ethereum has its chance to overtook bitcoin, actually it almost did it in terms of its marketcap but the idea suddenly died down and the flippening did not happened. So there's no way that Ethereum can do it again. Bitcoin is resilient and it can evolves itself from such kind of attempt.