Most people don't know much about PostScript except maybe that it was Adobe's first product. The founders of Adobe wrote this powerful graphic programming language to describe pages for printers. Their first customer was Apple. PostScript was used as the page description language for Apple's first laser printer. It enabled the desktop publishing revolution by becoming the lingua franca of printers and publishing systems. Very few people directly wrote PostScript. (I did, but that is another story.) It was usually generated by publishing applications like PageMaker or Quark. It was also generated by print drivers on Mac, Windows and Unix. In those days, mostly programmers who wrote printer drivers wrote PostScript code. The point here is that designers did their layout by drawing and moving objects on a screen, not by writing code.
Adobe is the most likely to succeed in this if they can figure out how to market such a thing without undercutting Flash. Apple may also do something here.