IMHO Nikon's patent is not meant to prevent the use of 3rd party lenses but to address theft. It looks more like a password protection mechanism where body and lens share a pass code. So, bottomline, as long as you know the pass code and they match -- No Problemo
So, if you steal my lens and don't have the pass code you're SOOL, cause you won't be able to mount that lens to any other camera.
From what I've heard over the years, Japanese companies such as Canon, Nikon, Olympus and Zeiss actually have partnerships with other Japanese lens manufacturers such as Cosina, that produce lenses for them, so I don't see the benefit of either Nikon or Canon changing this relationship to lock out Sigma or Tamron for producing lenses for either a Canon or Nikon mount -- unless of course they're expanding or ramping up their production to increase product availability of non-premium lenses.
Zeiss and Canon have a very close relationship. And Zeiss works very close with Cosina as well to the extent of actually having Zeiss personnel oversee and monitor production at Cosina's factory in Japan. These relationships probably exist with Sigma and Canon as well. After all, these manufacturing partnerships have existed for decades.
Or maybe they're afraid that Samyang, aka Bower, aka Rokinon, aka ProOptic, is just getting too good at producing low cost, quality optics
Nikon has already patented a technology that could - potentially - prevent the use of third-party lenses on Nikon cameras: