Oh I was right there with you on ARM-based Macs, and I still think they're an inevitable eventuality.
I don't know... I think the most compelling time for Apple to introduce ARM-based Macs was maybe last year or, at the latest, this year. From what we know of Sunny Cove, it sounds like a pretty compelling upgrade over Skylake. Also, Intel appears to be paying serious attention to improved GPU and NPU functionality. I'm not sure that an Apple-design ARM SOC in 2020 or 2021 will have the advantages relative to Intel that it might have had in 2018-2019.
i mean... it's not impossible. Apple has a great design team, lots of money, and TSMC is a fierce competitor to Intel. So if Apple really, really pushed, they could probably make a compelling alternative to Intel for Macs. It's just that Intel is raising the bar pretty noticeably relative to where it was a year ago. I'm not sure that it will make sense from Apple's perspective to fight that particular fight.
Maybe what we'll see is the continued evolution of the T2 chip, adding new functionality like a 5g modem and whatever specialized functionality that Intel isn't offering.