Personally, I think that BNB will never be able to overtake ETH, because these coins are of different levels and they perform different tasks for the market
no, BNB for now is just a newcomer for another similiar platform when developer can create their own contract using Binancechain like Ethereum.
and one poin i can feel when using Binancechain is this blockchain is more faster than ethereum for handle transaction, and other reason because BNB are backed by Big Exchanger Binance