The thing that's interesting is that 2015 was kind of a precursor to this; The only movies that ended their run at $200M were Mockingjay Pt. 2, Martian, Cinderella, and Spectre, and the latter two had some fudge in their numbers, so it's debatable if they truly count. I guess in today's world of rising ticket prices and shorter theater-to-ancillary windows, so this will likely be the new norm.
I'm almost guaranteed that next year will be a repeat. Even the movies that I currently predict will be in the $200M range (Lego Batman, Kong, Fast 8, Apes, Dunkirk, Ninjago, Thor, Coco) I have a strong suspicion will fall below or rise above that range.