You can see it in usage stats for desktop Linux. So many people have claimed over the years that they were going to change, yet never did. If they had, the usage stats would be much higher, but desktop Linux really hasn't gained much popularity over the years. It's sad, because it actually works pretty well these days, despite Gnome doing its best to scare people away by offering a radically different UI than they're used to and pitching itself as the standard (with most of the corporate backing).