I'd be up for it!
But why stop at 2'', if Apple wanted they could make the Mini a bit cheaper with lower end intel i3 and intel graphics to cut costs, in the current size. Then Mac a G4 cube sized Mac with the ability to upgrade the CPU, GPU and HDD(and makes room to opt out of a DVD drive for a custom built model...or if it was largest enough have two HDD slots to start with)
But Apple seems scared off from the G4 Cube, but I don't think the form factor from that device was the reason for failure, it was the other things such as a price of 1699. Why not make it lower, something like 1199, because while the PowerMac during the G4 launch where using desktop parts, the Mac Pros of today are using server grade parts. We don't have a headless Mac that can be upgrade that is has full desktop computer parts inside. The only issue might be beating out iMac sales, because it would be cheaper and/or have better specs. But I suppose it could be lower end in the CPU department when but level room for user upgrades. I can't imagine your average joe would upgrade it, but use, Macrumors users would be very interested in doing so.