Times do change. Quark ruled the publishing roost and was pretty expensive. Adobe came along with a cheaper pretender to the throne - inDesign. I think Quark is struggling these days.

Adobe was struggling a bit with Macromedia giving it a kicking with Flash and Dreamweaver. Adobe had the cash and swallowed up their rival.

Things change. Just think how Blackberry and Nokia ruled the phone roost. Sony?

Adobe has no clear rival that I can see.