Now on to the original post...I think the OP is way off in speculation-land. While I would love the X100 to herald something in the RF world, the fact is that it simply doesn't. It's not even an RF camera. It's a compact camera with some analogue controls, a fast lens, a relatively large sensor and a nifty viewfinder. It happens to have "retro" styling.
But stop for a second. The Olympus EP-1, EP-2 and EP-L all have "retro" styling, and relatively large sensors. They have a somewhat innovative EVF system. You can get compact fast lenses. The sensor is large, although not as large as the X100.
To me, this is just a continuation of a trend. People--and the camera manufacturers--are coming to realize that pure megapixel wars are no longer the way to win. We are now seeing more and more focus on image quality, and that is leading a turn towards larger-sensor cameras. Not only do we have the whole micro-4/3 ecosystem, we also have the Leica X1, the Sigma DP series, the Sony NEX series, etc. I do think its a matter of time until we see entries in this space from Canon and Nikon, and I believe that Canon is on record as indicating that they will be moving into this space.
I'm not really sure that this will have any real effect on the RF shooters of the world. The average person buying a camera like this will want AF. What this will likely mean to the RF users here is that we will have more options in the small camera with high image quality perspective--but I seriously doubt that we will see many other digital rangefinders.
What this could mean for Leica is that fewer people will turn to them in the future--maybe. I do know that a number of people came to Leica in the M8 and M9 days for the same reason I did--they wanted superb image quality in a small package. As more options for that turn up in other systems/formats, people will have other places to spend their money. There will always be a die-hard core of Leica fans that will buy almost anything Leica makes, but I think we all agree that Leica needs to expand beyond that base, which is likely only going to shrink over time.
What I would love Leica to do is imagine beyond the pure M model, and innovate in the small camera space. They showed a flicker of that with the X1, but I view that as a shot and a miss when compared to a lot of the competition. I think they can still carve out a niche in this space, which is their original DNA (remember, the original Leica was conceived as a compact camera for use while Oskar Barnack was out hiking).
Jeff