Apple is parting with Intel over quality control issues. That is the same reason why Apple parted with IBM and Motorola that and Intel chips were faster.

You will find ARM Macs are cheaper than Intel Macs, even if not as fast but consume less power due to mobile technology.

Microsoft had the Surface tablet with ARM chips and an ARM version of Windows which didn't sell as well, but then they are not Apple who won't make the same mistakes as Microsoft.