Linux is an exception in the non programming professional world. Accounting, project management, book edition, magazine layout, architecture, 3D object design... They are all eaten by proprietary software.

A few successful examples of usage of X (like Gimp) in the industry doesn't make it remotely in the same league as proprietary star Y (like Photoshop). Don't try to create a reality out of the thing we all wish were true. FOSS is not winning those battles yet.