I don't think it is "canon fanbois" driving the debate on FF sensors. It is also Nikon owners that see the likes of the 5D, and wonder why not them?
Costs will come down IMO. Canon has the edge over many other manufactures since they have the ability to build their own sensors and digital processing chips. IIRC Nikon relies on others to build these for them at this time.
That is why I said that outside of Canon, I expect Nikon and MF manufactures to be more in the $5000+ range for FF and better in 2-3 years.
You are right about the sweet spot of using 35mm lenses on the APS-C format. That is why, though the 5D is selling well, it has not taken the market by storm. Until there are digital specific W-A lenses for the Canon FF market, there will be many more wanting it - but waiting.
But by the interest (backorders) on the D200, there are many photographers that are seeing APS-C sensors as the "new" 35mm format. As I have said in other threads, photographic "film" format history is filled with much of the same debate that we are talking about today in regards to FF verses APS-C.
Moving from larger formats to smaller formats, photographers can struggle with DOF issues (both positive and negative); yet more importantly perspective issues. IMO, I think that I could tell a 4x5 "uncorrected" image of lets say a building, from an "uncorrected" on shot on 35mm.
Add to that as a past MF shooter, I love the DOF/perspective/bokeh of an 80mm lens in MF lets say at f2.8, over shooting a 50mm at f2.8 - focused at proper distances to maintain the same FOV.