I think what this is telling us is that we QuarkXpress users are a dwindling minority of desktop publishers. There are so few of us left that the xtension developers don't find it worth their time to make plug-ins for QuarkXpress.
We bought version 8 only because we need to create multilingual documents on occasion, and it was far cheaper to buy 8 than adding a license for "Passport" to our version 7. However, except when I need to create a document in French or Spanish, I use exclusively version 7. Besides being too inconvenient to manually activate fonts, version 8 is too prone to crashing. Not to mention that contrary to Quark's hype, the user interface is ugly and distracting.
We shall see how Extensis' wonderful new version of font management software works. If it's no better than their current offering, this will close the door on future upgrades of QuarkXpress for us.