Is not possible for ethereum to be the next Btc, it will be very difficult for ETH to have such chance for now, maybe later in the future.
It will need to struggle a lot if Ethereum replaces Bitcoin but I really believe that this will never ever happen because
Bitcoin is already proven for 10 years it has survived a lot of struggles and a lot of people saying that Bitcoin will be
dead but look at Bitcoin now standing at the top position on coin market cap with more than 50%+ total dominance
in the whole cryptocurrency market.