I have had much the same concerns for several weeks now, but did go ahead and honor my order to take a D100 when one was available. I picked it up a couple of days ago. So far, and I must admit my shooting has been very limited so far, I have been surprised by the quality of the images ON THE PRINT after some sharpening and adjusting in Photoshop Elements. Let me be honest, and I think all of us should be rather than being a cheerleader for Nikon, the camera has an issue with sharpness coming directly out of the camera. Anything you print will have to be " processed' in an image program of some sort. I rather doubt I would like the product I got if I used one of those " print matching" printers which print directly from the camera. At this point I don't know how much of an issue that will be with large numbers of users, but I must tell you it will be a marketing problem for Nikon because the expectations for this camera has been very high. For this and the other reasons you mentioned( I,too, am a long time Nikon F4 and F100 user) I wrestled with the D1x dilemma. For me, the answer was that $4000-5000 was just too much for my uses. And, the fact that subsequent models will devalue the D1x severly weighed against the purchase of of a D1x.Also, for me the purchase of a D100 will mean the need to buy a 17-35 f2.8 AFS zoom. My shortest lens now, a 24 mm, is now a 46mm, not short enough.
Just a few random thoughts. I can relate to your mental anguish. I had( and still have) it, too.