Since the PowerPC was an ARM chip, and the M series of chips are also ARM, it looks like it’s going pretty well right now.
What Apple has changed is that this isn’t a chip whose purpose is controlled by 3 separate companies with different priorities (IBM, Motorola, Apple) but is instead designed by and for Apple, based upon experience they intentionally acquired by self designing their own smartphone and tablet processors to get that engineering experience.
PowerPC is not ARM.