If you want a prediction rather than solid facts, I reckon that restrictions on tourists will be loosened once the current wave of infections is over.
I'm making this prediction because the Japanese national broadcaster NHK, which basically frames its news exactly how the government wants it to, has gone from placing reports on loosening restrictions for foreigners immediately before reports on increasing numbers of new cases (it's our fault, you see) to reporting about how Japanese tourism companies are suffering because of the lack of foreign tourists, thus softening up the, on the whole xenophobic, population to the idea of foreign tourists being allowed back in the country in large numbers.