I totally agree with your reasoning and I myself was a fence sitter ontill last Monday, where I caved and bought an iMac.
There is certainly a big gab in the Mac desktop product-line where a MiniMac Pro would sit nicely. I would even want it to have the same power as the iMac - how ever unlikely that is to become.
If not a miniMac Pro then why not just a Mac (without the pro and the xeon renderfarm and 8 drivebays and the 4 gfx board option)? I would love to see a mac based upon the desktop "E" models of the C2D chip. (Also very unlikely to happen)
But then apple made the iMac with the 8800GS and that made it appetizing for my needs. And I must say that I am very happy with it.
Edit:
I did actually contemplate a hackintosh for quite a while, because I too wanted something right in the middle of the gab. I got put off the idea because I wanted the whole Apple experience, and found it too much bother to put together an OSx86 box on specs. That plus it is piracy - obviously.
/Edit
Hi, I'm new to posting, but have read this forum a few times. I too am waiting for a new Mini. I have a G4 version. I really hope Apple keeps a reasonably priced, stand alone CPU.
I bought my first computer in ~82 or 83, it was an Apple llc. Big move, was it going to be useful, or just a door stop. I guess that could be labeled as useful. Anyway, on a comparison basis only, the llc of the day was similar to the iMac of today. What you see is what you've got. I owned the llc for a couple of months, sold it and went back in time, and bought a lle. Cool, now I could use the expansion abilities to taylor my new found passion to the way I wanted. Time passed, I bought a llgs.
Time passed even more, In ~ 91 I bought a 386 so I could buy an affordable program to use in my business. In 2001, after many upgrades, I was finally sick of the "blue screen of death". My eldest son led me back to Apple. Bought a used "Yikes" G4 tower"
Present day, I have a 1.5 G4 Mini. Great for what I now do. My monitor is great, I have a back lit keyboard so my tired eyes can lead my "not good at typing hands". My mouse works excellent. I don't want to be left in the wake of new OS-X's, so....
New Mini, yes please.