In time Apple may come up with a smaller mini but it’s fine the way it is now. My aversion to change is low so it wouldn’t be disappointing to see a smaller mini unless it was change for the sake of change. The “innovative” 2013 Mac Pro cylinder “trash can” is the case study on that. I don’t want to see apple “paint themselves into a thermal corner” again.The point I am getting at is the M1 logic board can fit into a smaller enclosure.
It would just disrupt a lot of people with the change.