The Big Ragu said:
There was a time in the early 2000s, when I was doing magazines, when I could have never imagined anything taking away the market from Quark. It's stunning just how unable they were to keep what they had. Too stodgy, too slow innovating and too slow keeping up with what Adobe did with InDesign.
Quark's decline has very little to do with the lack of innovation in its desktop publishing program and a lot more to do with Adobe having a much more diversified business from the very beginning, when Photoshop, Illustrator and other core CS products were first developed.
Individually, QuarkXPress and InDesign aren't that different, which is why we've all been able to transfer skills from one program to the other so easily.
But what makes InDesign (and the whole Creative Suite) so powerful is that Adobe is able to integrate all its products together — products that Quark had little interest in developing on its own. Adobe's been developing them since the late 1980s. Its dominance was a foregone conclusion. Once Adobe acquired Macromedia in 2003, there was no question that Quark was doomed.