I'm pretty sure that the Olympics will be cancelled. It's unlikely that we'll have a vaccine before then and Covid19 is well beyond containment at this point.
There will be all kind of athletes ill. Especially sucks if you're part of a team. I mean, for individuals as well, but as team you rely on each other's strengths even more. Gonna be interesting for sure.
In Japan, this could mean that it was the right decision to schedule the Olympics in the middle of summer after all.