If ever there was a camera system I could get into beyond what I have now (Nikon, Sony NEX and Leica) its the Fuji X series. I really love my X100, and applying these features and image quality to an interchangable lens system is highly appealing for me. There is one big problem: cost.
Lets do a comparison to a full frame Nikon DSLR system, with lenses that have a similar adjusted focal length and aperture, in this case assuming that the aperture relates to a depth of field. ie a 35mm f1.4 on an APS-C body should shoot very similarly to a 50mm f2 on a full frame body. I'm a prime lens kinda guy, so I'm going to focus on these for both systems, with Canadian MSRP quoted for both in Canadian dollars.
As you can see, to purchase a full Fuji kit is actually more expensive than the equivalent Nikon full frame kit. Each kit does have advantages - the Fuji body is smaller, the Nikon has far more lens options (both new and used, more megapixels and better high ISO capability as it is full frame. Lens size wise the Fuji has only a small advantage as we're comparing similar effective apertures, however the body allows the use of tons of different lenses via an adapter that the Nikon cannot do.
Given this, it would be tough for me to make a call to go out and buy a Fuji kit.