There are professional crews running Linux and using either Krita for art / comic work or Blender for modeling and 3d animation. The only industries really lack

There are professional crews running Linux and using either Krita for art / comic work or Blender for modeling and 3d animation. The only industries really lacking right now are video editing, which I believe Kdenlive is making great inroads on, and professional audio, which is the only major field that Mac Pros can target that is not really having their needs met at all (Ardour can be... something, but its UI is barf and the prerequisites to using it are fairly high). I guess we are also missing professional photo editing to match photoshop (Krita isn't trying to be one, and Gimp is kind of a mess) and 2d animation (in a world of toonboom and flash, synfig is a poor substitute). Freecad is also not a very effective substitute for CAD workstations, but to my knowledge those users have never left Windows for OSX in the first place.