The main thing about 2021 is:
Even if there is a vaccine against Corona / Covid in Europe or the US, as long as Japan does not approve that vaccine they won't change politics. Hell no, even if they approve that vaccine... that doesn't mean we are immediately allowed to enter Japan for tourism.
Our trip in 12/20 won't happen. I'm unsure whether to reschedule to 05/21, later 2021 or to cancel the whole booking and rebook it for 2022 when the situation has been lifted.