You know, I've actively wondered about that. At the moment, it looks like the Lestrange kids (Leta & Credence) might well be entangled in a prophecy with the Dark side. I'm not sure if it's a choice they'll have to make, or something entirely different, but whatever the outcome, I'm 100% positive it will mean interesting things for the rest of the series.

Remember what Zoe said? The Lestranges aren't bad, they're just misunderstood. And Crimes of Grindelwald is where it gets "really dark, really fast" for some of the characters, or so I've heard.