Probably not, I suspect "dwindling returns" for most future Nintendo Wikis. The biggest are in, except one more that will be added soon. For the most part, from here on out, I think we'll be looking at dedicated backing of each wiki from its fan community as a factor. Some of the others have a lot of potential, Star Fox, Earthbound, Animal Crossing, and Smash Bros for example. They have fragmented communities and the only existing wikis are on wiki farms. If some effort to unite the fan base under a single independent wiki can be achieved, I suspect they'll make great NIWA member sites.
The main obstacle, I think, is that people will have a hard time letting go of the work they did on a wiki farm-even if it means missing out on what may someday be the better known site. I think the passions for the independent wikis are so high because people can visit them and actually feel the creator's own love for the series. To me, the Neoseeker, wikispaces, etc sites feel more impersonal and disconnected than they actually are-but the few people that work on them should be approached delicately if creating a "rival" wiki. I say rival for a lack of a better term, we don't really compete head to head like sports teams or offline businesses do.