KDE, and Gnome are both toolkits flagship projects.
Look at how much developer share KDE gained, and Gnome lost in the time since Gnome 3.0.
The reason is they had few very toxic "thought leaders" who alienated countless developers, and they did not have courage to give them a well deserved kick to the butt, not even an idea that doing so would be right.
Now, if they want to recover, even if they will give a kick to Lennart & Co., how would they do so if they have no normal devs left to deliver that kick, and carry on the project after?