This is because there are many IEO projects lining up at Binance, but I am sure that this has never been a threat to ETH for the long term, moreover the BNB has not been widely available in many exchanges like Ethereum.
BNB has now become a popular coin, although now ethereum still has a good market, but until now the progress of BNB price growth also needs to be considered. ethereum has the opportunity to grow more expensive now because bitcoin is experiencing growth today. but to reach $ 2500 I think it's a long process.
BNB is now a very popular coin, since they switched from the Ethereum platform. But I think there's no need to worry for Ethereum about the BNB, because this will be a very very difficult task for BNB to pursue Ethereum. Moreover, the ripple can't go beyond ethereum.
For OP speculation about ETH going to $2500 I don't know for sure, which will definitely be a heavy homework for ETH after its 2018 fall yesterday.