"It's been said to that Nintendo's partnership with Nvidia was to last around 10 years. Naturally, Nintendo will want to evolve the Switch as time goes on, and release newer more powerful Switch models when they need to. With the Switch, making newer more powerful systems is actually super easy. Just swap out the X1 for the newest Tegra chip then go from there."
Unfortunately, it's not that simple anymore since Switch games ship with precompiled shader binaries which are totally specific to the Maxwell ISA so NVN shaders aren't even portable across different Nvidia GPU architectures. Nintendo practically designed the Switch in mind without even opening the possibility of forward compatibility with Switch software ...
If Nintendo does go ahead with designing backwards compatibility in mind for Switch software on their new platform then they'd have to at least convince Nvidia to design another customized GPU that's at least binary compatible with the Maxwell ISA and has all of the same fixed function capabilities but given that they dump their old GPU architectures all the time the prospects of a next generation Nintendo platform being backwards compatible with Switch software seems grim ...
