I'd personally love some sort of cross between a platformer and an adventure game...like, you'd start out in the Great Valley and you'd have free roam of most of it, with a bunch of characters from the films waiting around in areas to give you random minigame quests like in one of the earlier Spyro games (for instance, race against Cera to knock down as many treestars as possible before a timer runs out), but there'd also be one character you could interact with to advance the plot, and this would unlock new areas of the map and give you new tasks/minigames, and so by the end you'd have resolved whatever the overarching story was, but unlocked a giant sandbox stretching from "Big Water" to the environs of the first film that you'd be free to run around in. It could also be interesting if you could switch between characters, with them all having different abilities that they can use to get past obstacles and the like...
Seems like this would be the ideal mixture of elements to me...an overarching new story to get invested in, minigames for timewasting fun when not doing the main story, and at the end a huge world to play in and use for screenshots for RPGs and the like!
