I haven’t seen this idea explored and maybe it’s an obvious idea but I keep thinking about it so I thought I’d put it out there.
What if the first touch-capable Mac isn’t actually a Mac? Now that they’ll be using the same chip, what if they start by introducing an iPad Pro that can dual-boot into MacOS when attached to a Magic Keyboard or similar? And your Universal apps and data carry over between modes? That seems to me like a faster path to a touch Mac without actually releasing a touch-capable Mac.
Ridiculous idea? Maybe there’s no reason for such a thing to exist.