Cloud-based virtual machines
Personally I suspect that Apple won't get out of the mindset that macOS is what you get when you buy a Mac - they don't see themselves as a software company and the software they do produce is with one intention - to sell Apple hardware.
However... I'd be surprised if they hadn't considered offering up cloud-based virtual Macs, rentable perhaps even by the day. That way, they don't have to sell macOS as a standalone piece of software and they don't have to provide consumer support of the OS on virtual machines, and they do keep tight control over it (it only runs in their data centres). But it does provide a stopgap for when the ARM based Macs come out and people find they have some Intel-only based software they need and it would also be a godsend for developers of iOS and macOS software for whom even using cross-platform technologies are still more or less forced to use a Mac in a couple of places in the development lifecycle.