I use postscript all the time--as an automatically generated result of my LaTeX files. A decent set of LaTeX macros would let you make basic text+hyperlinks postscript web pages without too much trouble, I'd think.
True.
However, if you wanted scripted behavior in your generated documents then things could get interesting.
Just as people who know only plain HTML or use crappy site builders end up with simple static pages, those who do not wish to learn Postscript would only be able to make static pages. However, more advanced users would obviously learn Postscript and write their own dynamic behaviour, ala Javascript.
While this was very powerful and hugely entertaining from a geek perspective it was never going to be suitable for a wider audience - primarily due to the nature of PostScript itself. Don't get me wrong, I really liked PostScript as a programming language, but you have to admit that it isn't something that most people would be happy working with.