Amen; but I think that it is only some forum participants that have lost track of economic realities, talking of cameras that cost far more than many good medium format film options as if they were widely affordable options ofr photgaphic enthusiasts.
My guess is that for many photographers who are disposed to work in the traditional large format view camera mode with stationary subjects and many minutes spent making an image, very good results good could be achieved for far less than US$3,600 by stitching images from a quite modestly priced DSLR and a good sharp lens. With stitching, the gap between even the new low-price champion Pentax K110D ($600 with kit lens, probably under $500 when the body-only option comes out) and something for more expensive like a D200, 5D, D2X or 1DsMkII is only having to take about twice as many frames for the stitch-up job.
Good points. Besides, using even a 6MP DSLR at its full potential isn't as easy as it seems, and many of us could probably still gain something by sticking with our existing gear and focussing on knowing it and using it better.
On the other hand, there are IMHO objective reasons to invest in DSLRs like the 5D/D2x/1ds2.
1. IMHO, very few high end amateurs own printers that go larger than A2. With a D2x/1ds2, you have enough pixels on the long end of the frame to do one row stitches that have a quality high enough to use the potential of A2+ paper rolls.
A 6MP DSLR would require you to do 2 row stitching to get there, which requires a more complex pano head and implies a slower stiching routine in the field, furhter reducing the attainable scope for stitching.
Besides, we all know that stitching isn't the solution for all situations, and it makes sense to have a DSLR that can yield images with a resolution high enough to be compatible with large prints without requiring stitching.
2. I feel that it takes that level of resolution to clearly out do 35 mm film and get into MF realm, the traditionnal sweet spot for landscape in terms of compromise between usability and image quality. For those photographers that are able to resist the pressue of buying the best and the latest at each new release, this means that a 5D/d2x/1ds2 could remain a credible solution for many years to come...
3. The 5D/d2x/1ds2 cameras are expensive, but as I wrote before, so are cars for instance. I haven't owned a car for 10 years, which allowed me to save between 20.000 and 40.000 Euros. Even then, I coudl hardly afford a P45, but I can easily afford a D2x. Granted, not all people are in a position not to own a car.