Of course, Hassel announced a digital back for their cameras a year or two ago that will fit in the film housing backing. Even Leica has announced their digital line-up.
I worked in a digital photo studio for a while. Using digital SLR and a fuji thermalsetter to output.
The shooter would get a few hundred shots on a microdrive, download it onto a computer in the studio. Then the customer could choose shots right there, make an order (including touchups in Photoshop), and have their photos printed before they left (in most cases). It was a pretty cool operation. We even took the whole setup to some proms and such. I helped lug that damned 450 pound fuji thermal setter up to the 5th floor of a hotel for one... gack... have THAT run over your toes.. not fun. hehe. That was a cool night though. We shot prom photos, and downloaded to a powerbook. There were these custom frames that the prom committee had provided for each atendee. So we were taking photos and then printing out 5x7, framing them, and sending them home with each person. Pretty slick. Two shooters and one frantic night of photoshopping. 
Right now digital cameras for most photography are comparable in price and functionality to traditional chemical film cameras. They provide a lot of functionionality that isn't available with traditional film if you are committed to a digital work flow like the one I described. That fuji was about 4 grand, they had a couple older G4 machines and some laCie monitors... couple grand there... and the cameras for a couple grand each. All told, they recouped that investment back in the first months of operation.
Yeah, there are lots of things that you can do with wide film and slides that are nice, but even shooters that are going out and doing location shooting will often bring a digital along for test shots and documentation since it's quick return on preview.
Personally, I still use my Pentax K1000. 
$0.02
