Binance blockchain is actually not a threat if you ask me because in as much as they are creating a blockchain network which other decentralized exchanges can operate on their blockchain lack the use of smart contract hence not a full decentralized exchange as we all wish to see happen. Don't forget people with major blockchain updates by the Ethereum Network i know Ethereum will still stand tall amidst these threats from Binance. DEXs are the future of exchanges and Binance is surely not giving that so how can they overthrow Ethereum