Having used digital now for a few years, I don't think I could afford to go back to film, for example at last years Bournemouth air show I took nearly 1500 shots in 2 days, at a recent folk festival I took 900 in 2 days, similar story at a large rose garden over 800 in 2 visits. That would be a lot of film and a lot of processing, with digital it's carry spare batteries and memory cards, recharge the batteries overnight and upload the cards to the PC.
The percentage of "useable shots" is usually less than with film, but even so the total nuimber of good useable shots will be higher at far less cost.
With digital you can view your image as soon as its taken, if you ain't got it quite right do it again and it costs nowt except a short amount of time. If you're shooting a moving thing, aircraft, bird, vehicle or person, hold the shutter button down and take 4 or 5 shots, at least one should useable.