It looks like such a camera would be a welcome addition. The F5/F100 duo is a good example. Of course they both take the same film size, and I don't know how much of the weight/size of the digital beasts is actually a necessity from all the electronics and stuff like that.
For instance, these days I use the EOS 1V with the battery pack, not the booster. I don't need the extra shooting rate, and it makes the whole thing a lot lighter.
Would it be possible to have a full-frame DSLR with the spces of, say, an Elan 7/30V? Is the size and weight a function of the size/electronic requiremetns of the full-frame 35mm sensor?
Most enthusiast/amateur photographers, like myself, would be, and are, probably quite happy with the results provided by smaller sensor DSLRs. Say if you print only up to A4 or A3 size, and don't crop a lot after the shot, then you don't need full-frame.