First and foremost. NINTENDO Does NOT make Pokemon games. They just sell them.
Brief history: Stadium and Stadium 2 were both made by Creatures Inc. A Sister company to Pokemon Company who have shares with Pokemon. Colosseum and XD: Gale of Darkness were made by Genius Sonority. Genius Sonority has only been contracted to make 4 Pokemon games, while Creatures Inc takes most of the spin offs both in the past and presently.
As for "Fan Wants", based on sales figures, Fans prefer the handheld system games. They sell more than the home console ones. Gamefreak has no intention of ever bringing the main series to the Home Console, but we have Creatures Inc who will do that for us should TPC allow. The number of handheld spin offs increased more than console ones, they even tried to test out the possibility of bringing one of the bigger Spinoffs onto the home console which didn't do too well with sales.
While there are more vocal members screaming and demanding for specific changes, they are actually within the minority. Gamefreak has always given what the majority has asked for. They do listen to their fans, although majority of them are Japanese children.