Art of which a computer is the main subject exists. It's just not always obvious.
Let me elaborate...
First of all, I totally agree with you that we won't find eloquent oil paintings of a computer anytime soon, because the subject is, let's be frank, visually uninteresting. Even a G4 Cube, though a design tour-de-force, is not very artistically inspiring.
However, if you expand your definition of a work of art beyond the standard painting and sculpture and stuff, it gets really interesting.
Artist Lynn Hershman-Leeson, for example, has been involved in new-media art for a very long time. To give you an idea of what she does, one of her works is Difference Engine #3, where:
-The images of people entering the museum gallery are scanned, put into a database, and labelled with a number corresponding to the time in seconds since the exhibition began.
-People can visit the same exhibition on the Internet through VRML.
-To visit the exhibition, Internet visitors use the 3D-scanned model of a "real" physical visitor as their avatars.
-The physical and virtual visitors may interact and talk.
There's more to it, but you get the idea. This work of art raises many questions. "What is identity on the Net?" "Is being virtually there like being physically there?" "Are the lines blurring between virtual and physical?" "Are we stealing someone else's identity by using it as an avatar?"
Yes, it's quite conceptual in nature. No, it's not as obvious and as simply understood as a Howard Fogg. But it certainly shows that a computer is more than a glorified typewriter - as you put it, that it's the gate to a virtual world with its own concerns.
This is is one counter-example to the point your story makes. There are others.
Now, of course computer art is hard to grok. People have enough trouble understanding computers themselves, let alone art about computers. But I firmly believe that as the computer becomes a better understood and more familiar part of everyday life, that computer art will grow and acquire more of a following.
BTW, two coincidences I would like to share before I quit:
1) The story is titled "Ars Digitalis." There exists a contest called "Ars Electronica" (sorry, link in German) which regroups many of the computer artists whose existence this story denies.
2) I was just about to print my 15-page essay on computer art for my Fine Arts class when I stumbled upon this story :)
--KW [Diary] /* Do all humans pass the Turing Test? */