ETHEREUM has emerged as the main competitor to bitcoins crypto market dominance and analysts at Weiss Ratings have given ETH a more favourable score for potential profit than bitcoin and looking at the way etherium blockchain is been built where it gives room for many other coin to be built on its blockchain did you think, it can emerge as the most accepted coin later in the future than bitcoin and thereby overtaken bitcoin in price and value. 
I don't oppose these coins. It seems to me that they complement each other. I use ETH if the bitcoin network is overloaded. I think that I can apply this analogy: Bitcoin is the main coin and ETH is the serving coin. But this doesn't diminish the importance of ETH.