In my opinion, NVIDIA is far beyond this sector now and NVIDIA should just allow AMD, Intel & Qualcomm (maybe Sammy too... one day) fight it out for the scraps in this segment.
NVIDIA needs to focus back on the Shield TV (especially now that the SW2 has been released... unless the NDA hasn't expired yet), open doors to new segments/products and continue to push innovation where Apple, and others has failed to do to date.