Well here is how I see it:
Lambiel: even if he is only 3rd at NHK(and I expect he will be better then that and probably win)he will make it with 12(first) + 7(third) = 19
Oda: even if he is only 3rd at NHK he will make it with 12(first) = 7(third) = 19
Lysacek: even if he is only 2nd at Cup of China(and I expect him to win there)he will almost certainly make it with 9(second) + 9(second). Takahashi would have to win NHK to have more points and qualify over directly, very unlikely with Lambiel and the more consistent Oda both in that field, and if he somehow comes 2nd(I would guess 3rd personaly) then it would tie Lysacek's points, but the tiebreak is points totals and Lysacek has a big edge based on his SA point totals vs Takahashi's SC point totals. Lysacek is too consistent for Takahashi to make up the 13 points total or so deficit likely, and Takahashi is not likely to win NHK either. Weir who was 3rd at Skate Canada would have to win Cup of Russia over both Joubert and Sandhu to surpass Lysacek's points if Lysacek finished 2nd behind Sandhu at Cup of China. That combination of events is not even too likely, but more conceivable then the Takahashi/Lysacek ones.
Joubert-weak field in Trophee Bombard. Will almost certainly win that, and then even if he finished 3rd at Cup of Russia behind both Weir and Sandhu, will get the points 12(first) + 7(third) = 19 to make it.
The questionable ones I think:
Weir-Has to win Cup of Russia to secure making it. If he is 2nd at Cup of Russia needs Sandhu to be no higher then 2nd behind Lysacek at Cup of China, and be 3rd behind him at Cup of Russia, and then hope his combined points totals from Skate Canada and Cup of Russia beat Sandhu's combined point totals from Cup of China and Cup of Russia to edge him out of one of the final spots. If that is not the case then with 2nd at Cup of Russia would need Takahashi to be only 3rd at NHK, and his point totals combined from Skate Canada and Cup of Russia to beat Takahashi's from Skate Canada and NHK, being about 10 points behind Takahashi already after Skate Canada. If he is 3rd at the Cup of Russia almost no chance of making it unless there is a big upset with someone over one of these guys at one of their events.
Takahashi-Even 2nd at NHK does not make him safe, with that if Weir wins Cup of Russia he ends up below him by 1 point, but if Weir does not win Cup of Russia he automaticaly would be in over him if he were 2nd at NHK. If Joubert wins Eric Bompard which he is almost certain to and then only comes 3rd at Cup of Russia he still beats Takahashi by 1 point if Takahashi is 2nd at NHK. Lysacek even with only a 2nd at Cup of China, would beat Takahashi out of a spot in the final then unless Takahashi makes up 13 points around with his scores at NHK vs Lysacek at Cup of China. If Sandhu beat Lysacek to win Cup of China, then even if he only places 3rd at Cup of Russia behind both Joubert and Weir, he would beat Takahashi by 1 point if Takahashi were 2nd at NHK. If Sandhu is only 2nd at Cup of China and 3rd at Cup of China, Takahashi would automaticaly edge him out with a 2nd at NHK. If Sandhu is 2nd at Cup of China, and 2nd at Cup of Russia, and Takahashi 2nd at NHK, they would be tied and it would come down to point totals. If Sandhu is 2nd at Cup of China, and 3rd at Cup of Russia, and Takahshi is 3rd at NHK, they would again be tied and it would come down to point totals. If Takahashi is only 3rd at NHK he would still make it automaticaly if Weir is 3rd at Cup of Russia, and if Weir were 2nd at Cup of Russia between them it would come down to point totals, with Takahashi already a 10 point or so edge. If Takahashi wins NHK, which I highly doubt he does, he would be safe.
I think Weir might be the one to be squeezed out, but then again I think Weir has a better shot of a higher finish at Cup of Russia vs Joubert and Sandhu, then Takahashi does at NHK vs Lambiel and Oda who are probably the 2 guys to beat right now. Sandhu could easily be the 1 out as I could see him losing to Lysacek at Cup of China, and both Joubert and Weir at Cup of Russia quite easily. It will be 1 of Weir, Takahashi, or Sandhu who does not make it though.
Lambiel, Oda, Lysacek, and Joubert look pretty safe to me.