All people say Ethereum is the next Bitcoin, I don't know why they said that, but when I see the coinmarketcap, I know what they mean.
https://coinmarketcap.com/ so which coin the next ethereum?, The answer is no.3 on coinmarketcap,

So do you mean that usdt will be the next Ethereum ? you say that with only from sequence of number on coinmarketcap so it looks like a shollow prediction. only based on trading volume can't reflect the other aspects like features, development, etc.
https://i.ibb.co/Nrphgd0/image.pngWTH, they don't even have the same features and usability. maybe you can read some of the articles provided by Polkadot or NEO in this case it will really help you