Should I postpone my MEXT scholarship application process until 2021 due coronavirus outbreak? The next month I plan to apply for MEXT scholarship for a PhD study. My study proposal is almost ready and I have my thesis already written in English. But due coronavirus outbreak I was thinking to do anything I can to be prepared and on the next year actually apply for.

The main reason is because I plan to wait for a vaccine first for coronavirus, because my N5 level of Japanese may not be enough to communicate with a doctor in order to receive a vaccine. Though I was successfully examined and received a JPLT N5 Certification.

Do you think that is a good plan?
At this point there are no guarantees. Things could be fine in a year or not. There could be a vaccine or not. Japan could be doing well or not. The pool of applicants could be stronger then or not. Travel may be easier or not. There are just too many variables. 

Under the circumstances you are probably best advised to continue on with an application until you reach a firm decision point (acceptance, say). Perhaps more will be known then. But expect chaos in the near term. Too many governments are behaving incompetently and making bad decisions. That could change or not.