Yeah. I've been hearing about Linux Desktop for the last 20 years. It's 31 year old.
I think either desktops will disappear (replaced by commodified computers like Androids/Chromebooks);
Or a large company will set some kind of standard what Linux OS is; Or some other OSS OS will not make same mistakes Linux did and guarantee a saner target for app development than current Linux.
I want (3) to happen (e.g. Serenity OS blows up and just devours Linux marketshare). I suspect (1) will happen - Microsoft/Google/Apple just make their locked down garden and Desktop computers go the way of the Dodo.