Nintendo has issues with third parties and this is not new to no one, but third parties have to change as well.
For example, New Super Mario Wii sold 26 million unities according to our data and there is not a single relevant third party game on the Wii for that audience. Obs.: Rayman seems to not appeal the NSMW fans as sales of the game on the Wii were not as good as they could, so I do not consider that game relevant for the NSMW audience.
This is even more hard to believe if we compare the development costs/risks/time of making proper a 2D Mario clone with the resources needed make a good Call of Duty clone. I am not saying that CoD should not be cloned but NSMW deserved to have as many clones as CoD had this gen.
Sometimes third parties' behavior does not make sense from a business point of view at least to me. This is why I would love to have inside information and perhaps find an reasonable answer to questions like the one I mentioned above.