Apple has been able to create pro level software for both audio and video editing industries. If Adobe/Microsoft scraped its mac line of products, I bet Apple would have a competing product out in 12 months that graphic designers would flock to.
I personally got royally screwed over Nothing Real purchase (we had a site license of both linux and windows version).
Chalice, Shake (and Tremor), Final Cut, Logic, India Pro... - all acquisitions followed by "Mac only from now on, sorry".