Binance Smart Chain (BSC) is the next Ethereum although it's very hard for surpassing Ethereum for BSC but already BSC has become so much popular and now hot trend for new projects as well as old projects. Most of the projects are now born based on BSC which is a threat for Ethereum but it's for long time, not for short time. Polkadot is still on development stage, Now this place of BSC could be taken by Polkadot but still they aren't ready product like BSC.