[quotemsg=21374497,0,270726]How I would love it if Nintendo chose to upgrade hardware say from the 20nm Tegra X1 based on Maxwell to a 12nm FinFet Xavier based Volta.[/quotemsg]
Definitely not. Xavier is not made as a normal Tegra SoC. It's big, but most of that compute is for AI. So, it will be a big, expensive chip that's not much faster for things like gaming.
The highest off-the-shelf part they would use is the TX2, which is still a decent upgrade. Of course, it's not impossible that Nintendo got Nvidia to make a custom SoC, like what AMD has been doing for the bigger consoles.