The current mobile RDNA2 GPU variants do not seem to get quite enough supplies to threaten Nvidia's position, but AMD could solve the supply problem with the alleged 6 nm refreshes expected to launch in early 2022. Rumored to be produced on the TSMC N6 nodes, the RX 6000S models should come with increased energy efficiency and higher core clocks.
https://www.notebookcheck.net/AMD-rumored-to-launch-a-6-nm-Radeon-RX-6000S-refresh-for-its-RDNA2-mobile-GPU-lineup-in-Q1-2022.583807.0.html