What's needed is an open source Quark killer, the DTP equivalent of OpenOffice. The closest candidate we have right now is Scribus. Hopefully, in a couple of years, Scribus or another open source program will be mature enough to replace any of the many proprietary DTP solutions (Framemaker/Pagemaker/InDesign/Quark/et al.).

This whole dynamic is something I find fascinating. Development for Linux automatically extends the options for OSX users... but not for Windows users. Unless Palladium/TCPA takes hold, I don't see how Windows will hold its market share. Eventually desktop Linux will undercut Windows base, but Mac chic will continue to grow, since Apple has complete control of the hardware, and can use it to provide a richer, easier, more customized computing experience for those willing to pay for it.