>The old Macs really were the perfect form factor for a compact desktop computer
For certain types of work, they are excellent. I used an SE/30 as a dedicated writing and light programming machine for several years. It presents a friendly face, and the intimacy of the small screen is nice.
The small screen discourages distraction, though the small resolution was a bit of a chore while programming (lots of scrolling).
I'd like to see a toaster Mac-style box, perhaps with a slightly bigger screen, say 12", and with a decent resolution.