Taz Mangus
macrumors 604
Apple was referring to the FIRST ARM Mac's, not ALL Mac's. ARM architecture is no where near ready to compete with an Intel Xeon 28-Core system let alone the current base model Xeon processors in Mac Pro's and iMac Pro's. That's ways off. MacBook's, iMac's, Mac mini's will have no problem transitioning. Intel architecture will be supported for a while longer. I also stated 3-4 years, which is puzzling as your quoted reply is essentially in agreement.
I bet everyone will be surprised by what Apple has ready to go for ARM CPUs for their Mac computers. They have had over a decade designing their ARM CPUs. I suspect they already have prototypes running for most of their Mac lineup in their lab that go well beyond a A13 CPU.
Ampere Altra 80-core ARM CPU:

Ampere Altra is the first 80-core ARM-based server processor
Ampere has unveiled the industry's first 80-core ARM-based 64-bit server processor today in a bid to outdo Intel and AMD in datacenter chips.
Amazon Graviton2 64-core ARM CPU:
ARM News, Reviews and Insights | Tom's Hardware
Discover the Tom's Hardware take on the ARM product range, with news, reviews and benchmarking for the hardcore PC enthusiast.