Here's my take as a Pentax noob/ dual system user.
No please don't...
Leica is Leica. Fuji has done a great job with it's first attempt at a small form-factor, high image quality, fixed lens, rangefinder-ish camera. And
may be offering an inter-changeable lens model in the next version. The X100 was the only other camera besides Pentax I was considering for DX replacement.
I did not eliminate my APS-C camera and lenses just for giggles. I moved that portion of my kit to Pentax
because of their smaller form-factor DSLR (K-5) with excellent ergonomics and feel, robust build, weather resistance and small, high-quality primes. If I could have had that with Nikon's DX, I would have stayed there. (Full-frame is another story...) I believe that Ricoh/ Pentax could, with the proper changes to marketing/ advertising and dealer interactions, take some serious business away from the big 2.
Personally, I'd rather Ricoh/ Pentax
not spend any R&D money trying to re-invent/ improve someone else's camera just so "we can have one too".
How about spending that money designing and offering additional DA and FA Limited primes? A set that would give users the approximate equivalence of 24, 35, 50, 85, 105, 135, 180, 200, and 300, with macro available in the normal (50-ish), short telephoto (105-ish) and telephoto (200-ish) ranges. Some of these lenses already exist.
How about spending that money designing and implementing a larger, brighter, higher-eyepoint viewfinder with a large viewing window and a proper focusing screen? Size of the K-7/ K-5 camera body is
almost perfection... but the viewfinder is small. (Live view - yeah. Well... there
are some of us out there who actually
like using the viewfinders.
)