The only reason I think they might soon if at all is because the Nintendo Switch and the shield have similar SoCs. Tegra X1 with a Maxwell GPU. Well Switch 2 is close enough to release that people are seeing it and the SoC is showing up in benchmarks. Another ARM chip, but with an Ampere GPU this time.

So if NVidia is already building the SoC for Nintendo, it may be reasonably easy to make an upgrade to the Shield.