Waves is a good project, but in my opinion, EOS is the most promising replacement for ETH. EOS is a DPOS blockchain that can run 1000 crypto kitties without breaking a sweat, while ethereum is bogged down by a single dapp. On blocktivity, STEEM, an older sibling of EOS, is usually the blockchain with the most transactions per day, with nearly 1.7 million transactions per day at the time of this writing and it isnt even breaking 1% of its capacity, while ETH is doing only 600k a day at the time of writing and using 100% of its capacity, meaning your transaciton will probably not be in the next block and you will have to wait and pay more for the transaction to have it speed up. DPOS blockchains, like BTS, STEEM, and EOS, have no transaction fees and transfers instantly. Not to mention that you can use multiple coding languages on EOS, where as with eth you can only use solidity, which not many people know. That being said, still bullish on ETH too.