Rather than blanks, I'd prefer to see core pack releases. For example Bestiary 1, Advanced Players Guide classes, Inner Sea World locations, Ultimate Equipment, Ultimate Magic, etc.
And rather than ranking the monsters/cards off of AP1, 2, etc they could mark them with CR1, 2, etc(CR = Core Rules) to give you an idea of the card power levels.
This would allow people to create their own adventures by mixing and matching things from the stock core game. Paizo could also release conversions of popular modules pulling in cards from the various core sets.
If the card game remained popular I could almost imagine Pathfinder splitting out into a sort of dual release thing. Companions, Chronicles, Modules, etc all coming out with card packs along with their usual rpg component. The artwork is recyclable and the marketing could pretty easily point to both product lines.