They won’t be shifting for the high-end Macs, but likely for the lower end.
I have an Intel CPU in my old PC, which is limited to 8 gigabytes of RAM. I really want a new PC with one of those newer AMD Ryzen and at least 16 gigabytes.
Maybe after Christmas. sigh
Oh I am sure they will... Its an all or nothing proposition, just like when they left Motorola chips for Intel. Apple will not keep 2 run times for different CPUs.