FB1 in China opened to $40M and made about $85M total. This one is looking like $36-38M opening weekend, and will probably top out at $55-60M total.
Fantastic Beasts 1 opened to around $75M domestic, and had a better than 3.1x OW multiplier here for a $234M finish. I am going to guess around a 2.7x opening weekend multiplier for Fantastic Beasts 2 given the word of mouth. If you assume around $63M this weekend, that gives you roughly $170M domestic.
So roughly $320M for FB1 vs maybe $230M for FB2 in Domestic + China. Even if the rest of the world is around even, that's around a $100M drop from the first film. I am going to go out on a limb and say that international legs won't be as good either. So, sub 700M is likely. Maybe enough for them to do the third film, but they should start considering budget cuts.