dinosaurs....
True, Quark is not dead, but it's quickly going the way of the dinosaurs. If Quark doesn't offer an OSX version soon, alot of people will feel ripped off. My dad uses Quark everyday, but wants a new PowerMac. Too bad it doesn't boot up in OS9. He's pissed about it. Alot of people I talk to are. And the sad thing is if Quark 6 is released and there are major problems/printing issues/etc... there's going to be a backlash.
Think of it like the coming of the G5. Everyone was waiting for almost a year and a half. Holding out, waiting for that bad boy to appear. But low and behold, nothing. Now, I don't know about IBM 970, but if it sucks and we're getting crappy speeds out of it (hypothetically, because I know it'll be nice and fast!), there's going to be alot of angry mac users.
There will be nothing wrong with the existing products, but with a build up of expectation, the talk surrounding the new release, and the push from Adobe, the release of Quark 6 better revolutionize the layout industry. If it doesn't, Quark will just keep slipping on it's foothold.
I'd rather learn a new program today to be more productive tomorrow, than wait a year to feel comfortable about a productive program I already know.
Life's about learning, people! The more we experiment with new programs (InDesign in particular...), we either appreciate what we have or find an easier way to do something.