There is no need to put Ethereum under the shade of bitcoin. If it will become second BTC, then I am afraid it might lose identity. Bitcoin is bitcoin,Ethereum is Ethereum and Ethereum is a way too low from bitcoin. It has been a decade almost since ETH has been trying to defeat BTC but failed so far. 

Bitcoin is very fast in making progress and attracts the interest of new investors like bees go for honey. These are rivals but honestly, bitcoin can have a better challenger.