I'll throw my 2 cents in!
During my brief stint in graduate school (for studio art) I had this same discussion with several professors and was amazed to discover that none of them had a clue what digital art was really about. In fact, several of them dismissed it as "non-art"! Of course, these same professors barely knew how to turn on a computer let alone make art with one, so they had no real basis to argue from in the first place. The general consensus among them was that "the computer does all the work"...but anyone who spends any time with a computer understands that it's not that easy. I think that attitude comes more from a fear of the unknown than any logical argument against computer art.
For me, digital art and digital printmaking are very similar to the advent of recorded music or the printing press. 600 years ago fine art was accessible only to the very rich or the church. When the printing press was invented it allowed artists, such as Albrecht Durer, to create multiple copies of prints and sell them at much lower costs than one-of-a-kind originals. This allowed the European middle class to now afford art. I think digital art is just an extension of that printmaking tradition and allows far more people to not only enjoy making art but to purchase it. I can create an original image and run an edition of 100 Giclee prints...and I can sell each of those prints at a far cheaper price that I would one of my paintings. The fine art world is still very much dominated by powerful galleries/museums and rich patrons. As an artist, I would much rather cut the middle man and be able to sell my work for less money to a much larger audience. Digital art combined with Digital printing (such as Giclee) allows artists to do that and perhaps some people fell threatened by that.
This is going off on a tangent...but I find it fascinating that the computer and other digital tools (cameras, scanners) are changing our perception of what art is. More and more people are creating art (just look at how fast the Photo Art forum grew!) and it's becoming part of their daily lives...almost a daily ritual for many! The "Western tradition" of art is that it's something to be viewed in galleries and museums and only a certain elite can create it. In other cultures, art is much more of a daily activity and everyone participated (you could probably make the same comparison with music). I think we are moving more in that direction and it's no wonder that those in the "ivory tower" (like a few of my professors) are can be very resistant to things like computer art.
I should stop typing now...or I will go on an on...