Anyone has seen the market today, how much is altcoin dominance? I'm not sure that ETH will do that. Almost all altcoins that are at the top of the digital currency and have a large community, use BTC pair of their digital currency. There is still a lot of bitcoin dominance in the market, ETH will lose demand in market if they delete ETH/BTC.
Nothing can beat bitcoin for sure. Bitcoin is the whole reason why altcoins are surviving in this world. Ethereum is nothing without bitcoin. The whole digital coin depends on the king of crypto currencies, bitcoin. As far as the matter of dominance goes, bitcoin was is and will remain the dominant and no coin can takes it place. All of us can blindly trust bitcoin and altcoins need it for their survival.