At $79 for the suite, I don't believe these apps are trying to come anywhere close to Quark/Framemaker or InDesign. As for the LaTeX apps, I doubt many users even have X11 installed on their machines, much less the interest in creating documents formatted with tags. Back in the old SVR3 days I created many of my college reports formatted in nroff and troff. That doesn't mean I want to go back to those days
For me, these apps do pretty much everything I need, more easily, with more elegance, and for less than I can do with MS Office and thus iWork has replaced Office on my personal machine. At work I use NeoOffice when I have to do something iWork doesn't do, but I still (greatly) prefer the interface in iWork.
You don't need X11 for LaTeX. It's hard to imagine producing any mathematical document with anything but TeX unless you are thinking of just basic equations. While I quite understand your aversion to troff ( nightmares....) you might want to have a look at LyX. It's a very good front-end to LaTeX and it's free and doesn't require X11.
The addition of MathType 6 support to pages is good news. Hopefully they will get the baseline stuff right and support drag and drop. Nisus is wonderful for that and makes a perfect companion to MathType.