I'm sure at some point, they'll do like they did with both the PowerPC and Intel transitions - and abandon the first-generation early.
NuBus-based first-gen Power Macs couldn't run newer than Mac OS 9.1, and loading alternate OSes on it was an absolute nightmare compared to the second-ten PCI-based. (Plus the 601 CPU was pretty trash compared to even the "low-end-consumer" 603, much less the higher-end 604.)
First-gen Intel running Core Solo/Duo (32-bit!) got left behind only two updates later. Launched with 10.4, topped out at 10.6. And of course, was only 32-bit, when the G5 had already moved desktops to 64-bit; and Intel's Core 2 Duo was 64-bit for the second-generation of Intel. (And ironically, the "Intel Developer Transition Kit" was 64-bit Pentium 4!)
I wouldn't be surprised in the least if the M1 gets left behind multiple years before M2. (And yet all of the Apple Silicon devices in my house are M1/M1 Max.)