They might not drive hardware but they'll keep the core Nintendo fan sated until Nintendo can soft reboot the console this fall. A big problem the 3DS had in its first year was dire support for the first summer it launched. Now the next step is getting content out along with a price drop ready for the fall.
The only game that's been a truly missed opportunity at launch has been Wii Fit U being delayed when it would have done much better at launch or earlier this year.
I think Nintendo's marketing really has to go through an overall and maybe the bundles they offer. They should advertise their online systems much more and even incentive the bundles a bit more to enforce the Wii U being able to go online.
I was talking too a buddy last week about next gen and the new consoles and he brought up the fact that the One and PS4 can share video and screenshots. He was pretty surprised when told him that the Wii U was already capable of sharing screenshots.
Nintendo has a lot of features on the Wii U that they don't advertise and Microsoft and Sony will push the hell out of their similar features.

I mean the above screenshot is just a boring version of Wara Wara plaza and probably doesn't display as much information. (not sure if the one supports live tiles)