If my opening weekend prediction were based on online discussions about the movie and that curiously low RT score, I'd have predicted even less than 198 million. I kept expecting to see a sudden drop day after day but nothing drastic is yet to happen.
It's a Star Wars film. 'Everyone' is going to see it.
It shouldn't have any problem getting past 750M at this rate.
But this is 2017 (the franchise killer year), so failing to pass 650M, while unlikely, isn't impossible.