Imagine this: stick an M1-like CPU and GPU combo on a PCIe card. Run the games entirely on the card, using the host system as merely a way to provide data to the card. In one shot, you murder the AMD and Intel processor market - everyone can just buy the cheapest model and still play games, saving their money for the unified GPU/CPU board. It also paves the way for eGPU products for laptops becoming more mainstream, and could work towards a play for the Shield to become a console competitor (if cannibalizing their existing console business is worth it to them).

Also NVIDIA quit the mobile market a while ago. They are focused on Autonomous driving and embedded market. The only consumer product on the market with NVIDIA SoC is Nintendo Switch (which sells millions)