So, the WDC is wrapped up. But there's still a bit of excitement over the WCC.
Current standings from the official FIA.com website:
1 Mercedes 585
2 Ferrari 530 (-55)
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3 Red Bull/Renault 362 (-168)
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4 Renault 114
5 Haas/Ferrari 84 (-30)
6 McLaren/Renault 62 (-22)
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7 Force India/Mercedes 43 (-19)
8 Sauber/Ferrari 36 (-7)
9 Toro Rosso/Honda 31 (-5)
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10 Williams/Mercedes 7
At the moment, there are still two races to go with potentially 86 points up for grabs (25+18+25+18=86), assuming a 1-2 finish. This makes me think Mercedes is just out of reach for Ferrari, neglecting the chance of a DNF. For Ferrari to overhaul Mercedes, they need to decrease the gap by 23 points per race.
Mercedes vs Ferrari
Yesterday (Mexican GP), it was a horrendous day for Mercedes, yet Ferrari only gained 11 points on Mercedes with their 2nd and 3rd (=33) vs Mercedes with 4th and 5th (=22). Assuming worst case scenario besides DNFing any of the car, a 5th and 6th will still net them 18 points. Assuming Ferrari win with a 1-2 that's 43, so a net-gain of 25 points. Just enough to overhaul Mercedes within two races if they manage to do this twice. Which I doubt. It's more likely one of the teams could have a costly DNF however...
Formula B
Renault with a 30 points lead looks fairly secure, given they are only fighting for scraps of points. Assuming the best they can achieve under a normal weekend (...where the top 3 don't have a DNF) is a 7th position with 6 points, I can't see a large overturn of points happening. A 7th and an 8th nets 10 points, a 6th-7th 14 points. Worst case scenario, if you throw in a DNF and overhauling a 30 points gap just seems close to impossible.
On that point, Haas looks to be pretty secure in 5th too with a 22 point gap to McLaren. And given McLaren is barely keeping themselves afloat, they can be pretty happy to be in 6th. Force-India is behind McLAren by 19 points, but again, given they are only fighting over positions 7th to 10th (6 to 1 point), I'm not holding my breath for any miracles, even if McLaren is likely to not score any points (I think Stoffel was very lucky in Mexico to score a 8th place).
Fight over 7th position
I think the fight over who gets 7th position to be the most interesting. From the 3 teams of Force-India, Sauber and Torro-Rosso, I think Sauber is probably the one that could perhaps gain a position. They are only 7 points behind Force-India, so a points finish for both drivers in both races could mean they could make up. But for that to happen, I think Force-India, who has two very strong drivers in Perez and Ocon and a very strong car, will have to have two horrendous weekends, while Sauber will need good ones.
Permutations / Mercedes and Ferrari
Hard to do permutations for the lower teams, because while they could win a race, it's probably not going to happen. In anycase, Mercedes is 55 points ahead of Ferrari. With 86 points still up for grabs, the maximum Ferrari could achieve is a points total of (530+86) 616 points.
To put it bluntly, the maximum Ferrari will be able to achieve AFTER Brazil are 43 points. With the point gap currently at 55 points, in order to stay in the WCC fight, they need to gain at least 13 points on Mercedes in Brazil. If they don't, Mercedes has secured the WCC.