At this point, I think there is only one spot available on the podium for a non-Russian. I would expect that Medvedeva and Zagitova will be taking two places. I would expect a Japanese lady to take the other spot...the more erratic U.S. and Canadian ladies are more of a long shot, IMO.
Really? Then it's because of politics because neither Med nor Zagitova should be getting the high PCS they are receiving! At least Zagitova is less histrionic but both of them are a bit studied in the way they present themselves on the ice. And neither are that great with interpreting and feeling the music. They both move well and can rotate, which apparently means everything to ISU. And with backloading their tech they can rack up a lot of points. Medvedeva was over-scored with 80 pts this early in the season! The irksome thing is the hype and the way that their lack of maturity is viewed as just okay. When they do make technical mistakes, they aren't harshly judged. Of the Russians, I really like better Polina Turskaya whose skating I find much more genuine and musical re her presentation skills. But unfortunately, Turskaya has health issues.
As far as the Olympics, I think I will let the fall events unfold first. Plus, I think there will be a strong push for Osmond should she perform strong in the GPs. Turnabout is fair play. The Russians strongly pushed for Lipnitskaya and Sotnikova in the lead-up to Sochi. Their PCS scores began to rise suddenly. And it was plain obvious the push was for one or both not just to be on the Olympic podium, but for at least one (preferaby Lipnitskaya) to win gold. When Lipnitskaya faltered, Sotnikova saw her chance. Plus Sotnikova was hungry and fired up after being left off the team event for Russia.
Not to be counted out are Mai Mihara and Marin Honda, who are both very strong. I especially think that Mihara has an Olympic worthy fp, and she's capable of competing extremely well (Despite the fact she didn't do so well at Worlds earlier this year, she did win 4CCs). The Russians are very strong competitors, but they are helped by over-hyped perception of their invincibility and this alarming Lolita-syndrome that has taken over ladies figure skating.
That's the reason I will root strongly for Osmond, Daleman, Nagasu. All three are much more mature and are more solid performers with a better feel for the music at their best. Plus I enjoy Daleman's powerful skating -- these are real ladies and not teeny-boppers.
Of course it will be hard to knock Med off her pedestal with the PCS gifts from the judges.

Med has had to show not much over the course of her young career except that she can rotate, mime in overstudied fashion, wrap her arm over her head incessantly, and make OTT faces.
If U.S. ladies perform well, they should place well, but will likely have a difficult time reaching the podium. There are too many candidates, plus too much hype over the Russians and up-and-coming phenoms. So it looks like the only hope for North America is that Osmond and Daleman continue to shine and stake claim for that podium, with the political clout of Skate Canada behind them. U.S. fed has zip political clout and no clue how to play politics even if they did have more power.