Japan will never want more foreigners in the country. Even if the population shrinks substantially. And it's a right thing to do - a lot of cogs in japanese society rotate well only when all links use same predicaments. It will never work with foreginers en masse.
They rather lock the country again like Tokugawa did long time ago. As I am getting older, I support the decision to protect society from destructive traits that come with western societies more and more.