We’ve never really seen something like JW2 to make any real guess. The 208m opening of JW was fueled by nostalgia and great WOM by the GA. There was no real hook for a sequel, the nostalgia is gone, and the overall reception has fallen off quite a bit for that movie. It could hang on to a 170m-180m opening, but it could also fall off a cliff.
going off the overall domestic drop from Jurassic Park to Lost world and transferring that to OW, JW2 gets about 135m. A 70m drop off does seem high, so I’d peg it around 150-160m for now.