This question/concern may sound like a troll but is not. I'm more and more concerned on how relevant it is to dedicate energy to the development of next generation tools like LaTeX3, LuaTex, Tikz... Some people agree that the pdf format is doomed to disappearance because of its lacks of interactivity and should be replaced by (more open) formats such as html/xml and equivalent. In this context, will the rules of typography slowly become obsolete and what will be the goal of using compiling-like tools such as LaTeX? I know that as long as nice math fonts are not really available in formats other than ps/pdf, scientific fields will still use Latex but that may be over very soon. What are your thoughts on this?
edit 1: it looks like my rather provoking title yielded unexpected results. I just wanted to know in which extent LaTeX-like tools developers do consider possible evolutions in their decisions? As noted by Jan and Frabjous, TeX could be ported/converted to other formats even though it is currently mainly dedicated to pdf outputs.
edit 2: although I am a big fan of nice layouts and documents, the actual way of using pdf files is annoying. We have to open them in new browsers when we click on an existing hyperlink and they cannot be edited and require a full compilation for a single grammar mistake (when created with LaTeX). Maybe next generation computers will be powerful enough to compile LaTeX documents on the fly or technologies like
http://river-valley.tv/tex-and-the-ipad/ are the future. I am just wondering