I think that window closed around August/September. There was still a tiny bit of hope in early October, but even then it was very optimistic hope. The reality is the best case now is when the vaccine is widely available, so around July-August at the earliest. Even if things get better in February, I think Newsom is going to want to air on the safe side and wait it out until a vaccine, which might ruffle some Disney and Universal feathers again.
The good part is we have some viable vaccines that seem to work really really well. UK has already approved one and US will likely follow in the next week or two I'd bet and then it becomes a supply/distribution issue. There is light at the end of the tunnel but the tunnel is still longer then many (like myself) wish it was.
I speculated this on the rundisney forum earlier so I'll add it here to but it wouldn't shock me that in Q3/Q4 or 2021 things try to go back to normal but require proof of vacination. I could see rundisney wine & Dine being in that category... run the race but only with people with proof of vaccination. Sporting events and the like I could see do the same.