It's trivially credible that Apple will use its own chips in macs - it already has cpu's faster that its low-end, ultra portables. They could have done it years

It's trivially credible that Apple will use its own chips in macs - it already has cpu's faster that its low-end, ultra portables. They could have done it years ago. But less credible that they will only use their own chips. However, there have been complaints that Apple's high-end hasn't been very high recently - maybe laying the ground-work, lowering expectations?