most probably next years we still need some stick rules for this all as right now all world is locked down and numbers are increasing very quickly next 1 or 2 years are very important for this all specially gatherings need to be restricted for some more time.
You are over-estimating the impact here. Firstly, a vaccine will be ready sometime next year and majority of the world will probably be vaccinated by the end of 2021 which is why this is an issue for 2020 and 2021 only in my opinion.
3 companies are now doing clinical studies on the effective of the vaccines they created and it will take 8 to 12 months, so by that time they have already released the vaccine and also by that time countries have set up their own system too contain this virus, but as long as the vaccine is not yet release in the market, the Olympic is unlikely to be held.
The Olympics does not depend on the vaccine. Instead, it depends on whether the virus has been contained and whether the cases have been dropping or not. If the virus is contained, they will definitely go ahead with the Olympics next year.
