Doctor Strange actually made $2,210,912 this weekend, which is a 51% drop from last weekend.
So it dropped less than TDW (52%), and TDW didn't have any big new competition in weekend 7, that's pretty impressive.
It made 1.65x more than TDW over the weekend, it should easily be able to make more than TDW made from this point forward.
TDW fell to 319 theaters on the 48th day (DS hits day 48 on wednesday and still has 1923 theaters left today).
So even if DS loses almost all of it's theaters this week, it should still easily make more than TDW after the 7th weekend.
TDW made $5,582,269 after the 7th weekend was over. DS made 1.65x as much as TDW did last weekend, and that multiplier has only gotten higher every single weekend.
For some reason TDW seems to make a slightly bigger percentage of its gross on weekdays, so if we assume DS makes 1.5x as much as TDW after the 7th weekend, it will end with $234,634,343 domestically.
So I'm expecting it to end with about 235M domestically, possibly more if it can hold on to its theaters better than TDW (as I said, TDW fell to 319 on wednesday).
OS it's losing a few markets, which means it will have weaker legs OS than domestically. It made $700,000 OS over the weekend, and it's hard to predict how much more it will make because there are so many different markets to take into account.
It clearly won't make as much OS as it will domestically, I'd say about 2M, but this is a rough estimate.
That would mean the WW total would be 664M without Japan.
Then there's only Japan left (it opens there on the 27th of January). I don't know if we can say Ant-Man is the floor, since after the big MCU movies (Both Avengers, Civil war and Iron man 3) and Iron Man 2, Ant-Man was actually the most succesful MCU movie in Japan.
On the other hand Doctor Strange has been doing very well in other Asian markets, and combined with the growth of the Marvel brand I can see Doctor Strange beating Ant-Man to get 10M+ in Japan. But this far from the release date, there's really no way of telling exactly how well it will do.
10M in Japan would mean a final WW gross of $674M if it all goes as expected.