Many would love to have a portable/luggable desktop (and silent) computer that is not a laptop. But not at the cost of losing too much performance and too many I/O ports. It would be better if it was introduced as a separate product, e.g. Mac Tiny (lol) or even make it the next Apple TV. I always believed that Apple do not offer enough options to people and I am not talking about colours.
In an ideal world we would have a Mac Mini/Studio compact desktop that is still user-upgradable like in the old days (or even better, like the incredible G4 Cube) and an even smaller™ portable computer that you can carry in your bag, at work, at University, when switching jobs/cities every few months or years, when you go for long vacations, etc. Or fill a few needs at home (small server, retro game machine, AV media player, etc. As much as I like SBCs, there are too many times that they do not get the job done.