I imagine once a lot of the cleanup and maintenance is done on what they have, they'll be in a better spot to accelerate support for other SoCs, and it probably won't be half a decade before the M6 or whatever is supported.
All said, Apple could just spend a tiny tiny amount of their warchest and just ship some goddamn drivers for Linux a la Boot Camp and save the Asahi team the time divining it from the tea leaves.