With GNOME 3.0 being such a major (and controversial) redesign, there are plenty of people who would say that it should be delayed for further refinement of the design. Most notably, Ubuntu has spurned the new GNOME Shell in favor of their Unity desktop environment. However, GNOME's got a history of not second-guessing or reconsidering their UI changes just because they're controversial. Also, the crazy talk about a GTK4 is a dead giveaway.