1. Sleeping Dogs 2- A great game that works for several reasons in this scenario. It sold very poorly, so it's not going to be like buying a huge franchise. It was very well received by fans and critics and would seriously bolster their library. Also it could serve as a viable substitute to the lack of Grand Theft Auto 5. This is one that I would very much like to see.
2. Anything Sega- Sega is in a bad place and doesn't really have the funds to bring out some of their franchises. What if nintendo funded a new Jet Set Radio? Or something in Sega's list of franchises.
This tactic that is used is really a great way to fill the library. Nintendo can't fill it themselves, and we saw that with the Wii and are seeing it with the 3DS. You need third parties. Since Nintendo insists on having unique systems, they need games that are made for the system. What are some other games that could be exclusive-d.