"Currently, it is surely one of the greatest digital cameras ever produced and is certainly one I would give my right arm to own. "
Wouldn't that make it rather difficult to take photographs?
Basic sampling theory...
No anti-alias filter = FAIL.
While you might be able to get away with it with crummy lenses (effectively using the lens as the AA filter) or massive oversampling (as in the 50-60Mp medium-format backs), in this format and with high quality optics all you're doing is smearing aliasing noise over the entire image. The most obvious example is how badly the M9 suffers from moire with high-frequency patterns, but the fact is that all the image is contaminated. Leica gets away with it because lots of people interpret the correlated noise patterns as detail.
You're kidding, right?
I honestly don't understand the fascination some people have with rangefinder cameras, or Leicas in particular. yes, they're well made, and yes, you have a pretty good manual focus system. That's about it. The rest of it just seems to be daring to be different and holding onto old-tech in the belief it's somehow better.
The pics at ISO 2500 have some serious noise in them, much more than my Nikon D700 (which is also full frame), not to mention how the Nikon can do faster follow up shots.
Any of the pro Nikons with a metering tab can mount any F-Mount lens from 1977 on up, and with some machine work older lenses back to 1959, and a lot of them are darn good.
The last rangefinder I used was an Argus C-4, and then as with the Leica I couldn't see the appeal, especially since the mirror reflex system itself is now considered old school.
Finally, the nail in the coffin for me is the price. This should be a $700-$1000 camera competing with the likes of the Canon G11, for the cost I could honestly buy a car.
If you want a VAST range of lenses
get a Nikon SLR. I mean, come on, where are the teles and zooms for Leica M? It's not the 1950s anymore.
I'll stick with my M2, 52 years old and so long as I can load up Tri X and a few slide films into it, it'll keep on truckin', I'd need to shoot a lot of film to get close to the M9's price! (About 1650 rolls exc. processing...) That said if you prefer rangefinders and need digital, you haven't got much choice (Epson RD1 or the M8/8.2)