The cost. I already owned two computers and printers and needed them for my home business so they aren't part of the cost of photography. My first "real" camera was a Canon A-1 purchased in 1980 for $500 + $500 for a zoom lens. The cost of a 30D + 24-105 was not terribly different in real dollars, but the cost for recording media (film to CF cards) has dropped dramatically. And the CF cards are reusable.
The point is that doubling or tripling or quadrupling the number of images captured doesn't seem to raise the cost.
There is also a cost in time sorting and storing negatives, slides, and prints, whereas flipping through a computer takes moments to locate an image to print. I wonder how many photogs that do this for a living would like to go back to the "good old days".
I do spent far more time developing my images, but that's because I can actually make significant changes to them. See the current thread on what is a "real image" - creativity has increased immensely with digital.
I seldom print anything these days - e-mailing jpegs of my granddaughters to my daughter. My wife has a "Kindle-like" LCD display on the counter that flashes through hundreds of images continuously which can be changed in a few minutes.
Ahhh, the good old days - don't want them back. Photography came alive for me with digital.
Glenn