I was there when Linux overtook proprietary UNIX in the late 1990s / early 2000s and agree completely. The Solaris and HP/UX stalwarts who laughed Linux off as

I was there when Linux overtook proprietary UNIX in the late 1990s / early 2000s and agree completely. The Solaris and HP/UX stalwarts who laughed Linux off as a toy for hobbyists changed their tune pretty quickly when Oracle announced support for their flagship database on Linux. Adoption quickly accelerated as other software vendors announced support. Obviously Red Hat was the winner in all of this, but they could easily lose their lead if another Linux vendor gets serious.