I'm guessing Nvidia kinda just gave up on the newer Tegras because the Android market for them is pretty much dead. Nobody needs that much power to play Android games. Meanwhile, Nintendo, the automotive industry, and the Jetson series have all been much more lucrative markets for Nvidia, so it makes sense why they're a higher priority. In each of those markets, Nvidia has pretty much no competition (yes, I know there are other console makers, but Nintendo has a lot more in-demand exclusives). It's only been very recent when Tesla announced their own processor to replace Nvidia's platform, but, Nvidia still has plenty of other customers.