According to the consumer marketing director at The Pokemon Company JC Smith, one of the big hurdles that Game Freak and other Pokemon devs have to endure is the balance between massive fan demand and the developers' own specific vision for each game.

“...there’s also a vision for what the creators want to provide, and it’s [a matter of] finding that delicate balance throughout. We have a group of creators and professionals working at the Pokémon Company that have been through a lot – seen, heard [a lot]. They have thicker skin than many people do because they’ve heard it.”

Smith also revealed that the company does listen to fan demands of wanting a grander and more sophisticated game in the series, but he also revealed that Game Freak very much strives to make future games extremely accessible at their cores as well.
Contributed by PirateGoofy