I think CAD is a great example, because CAD products do exist for Mac OSX, which at this point is the only viable competitor to Windows, even including a 2015 p

I think CAD is a great example, because CAD products do exist for Mac OSX, which at this point is the only viable competitor to Windows, even including a 2015 port of AutoCAD. BIM exist, like ArchiCAD. It's not that the Mac is a complete dead end, but the resources required to target the Mac are non-trivial and it has to be worth the investment. For years high end Unix workstations dominated in the 3D graphics and design field, in engineering, industrial design and fabrication, basically anywhere a computer+engineer generated the kind of income which justified a $50,000 computer (epitomized by SGIs and Dec Alphas) plus equally or more expensive software licenses. What happened is the bottom dropped out of the hardware market. The Pentium Pro came along, Windows NT 4.0 was released with OpenGL support, Nvidia brought powerful 3D to the consumer desktop, computers with 256MB or more of RAM were commonplace, and all of this was available for a few thousand dollars. Over time, almost everyone making software for these platforms either jumped ship or went broken. So while there's a historical precedent for this same migration in the computer field, something's different this time. There's no room at the bottom.