I'm wondering if now is the good time to buy BNB or should I wait a little bit more? The crypto market is still bearish, so we should expect further pressure against an altcoin like BNB in the short term. Who knows if BNB will reach higher prices in the future? Your input will be greatly appreciated. Thank you. 
Since everything is speculative, there's no accurate answer to that. Looking at the situation you have mentioned, it now depends on how you looked at it, either as a good sign to buy more or you are anticipating to crash more. Technically speaking, we can consider our decision based on how that event and situation impact the BNB market since then.
If we buy or not, maybe not because of the recent situation happening around Binance, but rather we more on believing that "it's really the right time now".
Your decision mate, it's your money at risk in the first place.