I believe ETH may not surpass BTH. THough, ETH is a promising cryptocurrency and the second best from BTC. ETh has an amazing possibilities with the use of smart contracts and programming codes. Though, It currently has scaling problems and potential issue of immutability.
it is hard for ethereum to surpass btc because ethereum needs more work to follow the price of btc. people know bitcoin than ethereum although now there is many project or ico based with ethereum but people still choosing btc for the king of crypto currency. but ethereum have potential to be increase for the price so we only need to waiting. ethereum itself needs more time before the price can increase and i think ethereum will be stay at number two for the position in crypto currency list.