Unfortunately, this will happen for sure. Flight tickets and hotels prices will go through the roof due to massive demand while supply has been reduced. I also expect that in particular domestic travel in Japan will sharply increase. For now already, prices for hotel accommodation in Japan are not down, as I originally expected. I am currently planning an onsen trip to Izu or Kinugawa in February, as soon as the state of emergency is lifted. No special offers or discounts. Some hotels have closed, and it seems the remaining are well booked.