what if ethereum failed then who will replace it?
first, ethereum deemed to fail, i have said this again and again seen the beginning, even little kid could see and know it. example if you have a door and everyone want to get through that door at once, this is what happen to ethereum, it come to a halt! the bloat, the network, the centralized control by one young man... all and all the future of crypto will be in sidechains at least this will fixing the bloat and network problems.
i like ark because it have blockchains interoperability and sidechains.
Ethereum is just the start, there is much more to come. That's why i don't get why people act like they are married with ethereum.