I'm not convinced another sku is the solution. It'd probably work out better to just drop basic completely, and provide a range of Premium bundles with different games included. Say, one with Nintendoland, another with NSMBU, and one with Lego City. Add more later as 3D Mario and Mario kart whenever they come out. Some more third party packs with Monster Hunter, or any willing 3rd party games might help too.
Possibly have them all include a digital nintendoland + one another retail game, the cost of a digital nintendoland is minimal, so it shouldn't affect price too much.
Nintendoland isn't a bad game, and I'm glad I have a copy of it, but it absolutely is not the system seller that Wii Sports was.