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Its not so much about the space as it is the costs. Carts cost more than discs and the higher the capacity, the greater the cost. Some 3rd parties have resorted to only putting like 1/3rd of a game on an 8GB instead of going for the 32GB carts for that reason.I imagine storage wise they'd have to be on two cartridges seeing the cartridge seems to have less storage place. Of course they could always have the cartridge just contain the biggest assets and download the rest to complete it.
I'd imagine there'd be a digital collection, where you can get 1.5+2.5, which if there is I'd probably get.