Caleb Hailey responded to my comment about a MacBook Neo-class Mac:

When the redesigned Mac Mini was announced I had hoped for it to be USB-C powered. But a Mac Nano (or Mac Neo) would be an even better fit for a USB-C powered Mac that could be used in all the ways you can use a Raspberry Pi. I bet they could beat the old Mac Mini pricing for a device like this, and ship it at $299-399.

I wouldn’t expect Apple to go that low, but even $499 would be great. It could literally be the same components as the Neo except no screen, no keyboard, and no battery.