I think NX will be a unified platform featuring a family of devices that share a software library. That would mean Nintendo would no longer be splitting their own resources between two separate devices causing droughts on each platform. Nintendo will be able to diversify more and be less dependant on 3rd parties with this setup.
In terms of 3rd party support, I believe it will be similar to what 3DS+Wii U have. Strong indie support, strong kid/family friendly support, strong Japanese support.
I also believe at launch we will see decent support from mainstream western titles similar to what Wii U experienced. EA, Ubisoft, Activision, Warner will each have 1-2 games mainstream games at launch and future support will be determined by how well they sell.
When the herd loses its way, the shepard must kill the bull that leads them astray.
