Why could Fuji not just go and buy Canon film SLR and make it a
dSLR just like S1, S2 and S3 with Nikon? The Fujifilm pricetag has
(had) enough premium anyway...
Fuji bought parts from Nikon, not an entire working body. You have
to remember every dollar counts. Its more than just parts, in fact
the main cost is R&D. This has to be spread out with volume.
If Fuji spent the money, they could make their own body and use any
and all mounts they wanted.
Nothing is impossible - it is just expensive.
What ever they made would have to be superior to the D2X, D200,
1DMKIIS, 5D, and maybe the Sigma SD14 OR it would have to cost less
in amount that the value proposition warrants the purchase.
W/O their own mount, Fuji has to compete head on with Nikon, just
for F-Mount users. If the price and performance of either of these
two is not greater than Canon - a mount switch.
Tough choices. So, by buying Nikon parts, Fuji can play in the
sensor field and do so with limited resources. In the end, sensor
technology is the most costly.