Tajiri left after Gold and Silver, but the interviews with the other staff still show a passion for the series. This anon
>>38662282 makes solid point about DPPt. BW were clear passion projects. Sequels were made because the staff wanted to revisit the region.
But things after that seem muddy. Sugimori's been tapped out for awhile and has been moving away from the franchise. You can tell he misses the pre-pokemon days. Masuda has no idea to how appeal to both the hardcore demographic and kids and is driving himself senile trying. The Town interviews show that the staff is tired of the series. When did the burnout kick in?