>>37672957The people who want new content are a minority, as evidenced by LGPE's beyond-successful sales in Burgerland managing to prop it up to an average Non-Generation Debut Pokemon Game's sales,
GameFreak is more likely to lose sales by bothering with new content that has no guarantee of being liked and thus making or breaking a customer's decision to purchase as they would rather not be subjected to content they will dislike, than they are to stick with what clearly works and won't alienate or offend anyone as they already know they like said content.
