My impossible dream is that Apple would simply release a microATX motherboard containing all of the "Mac goodness" and bundled with a license for macOS.
Or just sell a copy of the OS, and write a few drivers.
i would settle for a barebones machine with the basic CPU, onboard graphics, and like 4-8gb of ram but the ability to add in whatever cpu(s) and GPU i wanted, under $2000. Preferably around the price of the base imac.