Oxford's Covid Vaccine Front-Runner Is Months Ahead of Her Competition
bloomberg.com
bloomberg.com
The 50 percent effective goal WHO and others give is very low. It's not enough to provide herd immunity.
That said, I'm not sure other vaccines will be dropped. If any of the other candidates can give sterilizing immunity, that would be preferred.
The "race" is just to avoid shutting down the whole world again, and many governments are afraid of an uptick of cases in the winter.