I think that the max year rotation is 100
Another idea that I have is that if I put more than 1 possible host nation for a year on rotation, will the game have a preset nation from the moment I create my save, or it will decide it after the previous World Cup ends. If it's the latter, that way I can save scum so that it chooses the nation I want.
For example, if I put Japan and South Korea on the possible host nations list on the year 2002, with a 100 years rotation, so that it choses them for the year 2102, can I save just before the host nation is announced in game (after the 2098 World Cup), and reload the save so that the host changes every time? Sometimes it might chose Japan, and other times South Korea. Would that work?
Also, it sucks that it won't let you choose a double nation bid on the "possible host nations" list, like it does let you on the "host nation" list above.