No, I strongly disagree that the number of foreign workers in Japan will increase in the future.
I have two reasons to support my opinion. First of all, there are unpopular jobs.
For exapmle, everyone do not want to do that unpopular things such as English teachers because that there are less people, and that those people might feel lonely. So, foreign workers are less likely to work in Japan. Second, the progressive aging society. For instance, since many young people do not want to raise children anymore compare to decades ago, people are getting older and less are considering to work at foreign country.
These are the reasons why I strongly disagree that in the future, the number of foreign workers working in Japan will increase because there are unpopular jobs and that there are also aging society problems. Cambodia , Romania, Africa etc. = can not speak English properly
( Not everyone can speak English )