What else can a move to ARM bring ?
Most of the comments here look at the problems of getting existing programs to work on a new architecture, be that via recompile or emulation or something.
An Apple designed CPU could bring a whole range of new instructions, maybe doing some of the things that are today offloaded to GPUs. This might help with more AI (whatever that means) and other needs where new silicon could give great advantage. Apple will not share its designs and will probably patent what its new silicon does to stop others following suite.