The Japanese team has the easy draws until the 2nd round at least. The team is "lucky" need not to face the Thailand or the South Korean team, only the weak Kazakhstan concerning the fellow Asians plus some other lesser teams. Btw talking about this, the World Cup's Round-Robin format is the best, the fairest... Just no luck of draws and inescapable, every one must face every body, love it or not... no argument, no doubt, no dispute!
But that could be a very decent small prize to earn from throwing in huge money to host the largest event in volleyball... just imagine, 23 guest teams times how many official headcounts per each team, then over two week duration! And the Japanese team plays an interesting volleyball to watch, and its name guarantees a strong contention in the Asian Continent. I also love to see Japan hosting the volleyball events, it's a quality and friendly host (basically all these three Asian NOC: Japan, China and Thailand are the very capable hosts with the various excellent infrastructures), and of course its time zone is very friendly within the own continent Just love it!!
This would essentially be an entire month. You cannot play every day per FIVB rules. So you could play 3 matches in a row over three days. So you need 4 cities to host each 3 day round (and the finale with only 2 days). Let alone have simple connections between cities for teams. There would be probably be 2 days when you switch cities. I can't see the FIVB ever doing this. Let alone national teams wanting to do this.