Earlier quoted context omitted.
Well, the meaningful way for UNIX (and Linux) to succeed as a popular product, according to the aspirations of its proponents, was on the desktop. It wasn't just about the server side back then (late 90s, early 00s) it was all about taking over Windows. If somebody uses some hardware product (e.g. set top box) and doesn't know its Linux, then it's no big win for the Linux community. And it's not just necessarily that…
The only successful desktop UNIX derivative is MacOS. That ship has sailed. However the most relevant computing devices for consumers are phones and tablets nowadays, not desktops. UNIX derivatives run almost all of them. Big success, I'd say. UNIX derivatives are running most servers too and are making inroads into the Windows desktop. The outlook is good unless a new popular market suddenly open with no meaningful…
I don't think anyone thought Linux to take over the office desktop by mass porting office applications but by moving them to the web. That shift is still happening.