I saw some of these mock-ups and certainly i will pay for alternatives like elementary os instead of non unix-like os, your work looks great and i hope it will be developed in a short time, my suggestion is "get focus on productivity apps" like libre office, gimp, calibre, octave. When linux community understand that apps like office, photoshop, autocad, matlab are making us slaves of proprietary software and develop alternatives usefull, fully featured and beautifull like your community propose, a gross of windows and mac users will come to linux.
doctormoProfessional Digital Artist
Gimp redesign is actually possible, they use gtk3 and css. So many things can be changed. (inkscape is all hard coded, so the above design would take years of man power)