1. Animation needs a lot of resources and funds, and it takes enough time to complete the production process. If the production company doesn't get enough money or time, it may not be able to shoot the third season.
2. Another reason may be that the original comics or novels are not enough to support the plot of the third season. The production company needs to ensure that there is enough content to make a new season, otherwise it may affect the quality of the whole series.
3. There are some other reasons, such as the departure or replacement of producers, which may also lead to the inability to produce in the third quarter.
In a word, there are many factors that may affect Saiki Kusuo's production decision in the third season. If you want to know more about this problem, you can consult relevant news materials or consult the production company or relevant personnel.