If you have specific workflow where the golden path is suboptimal, sure. But I would not think that average user has any preferences and for many users Gnome is very reasonable.
hypercustomization is cool, and I like that KDE gives hobbyist something to experiment with.
I think in the long term though, KDE and gnome need to solidify. Something gnome-like for the base user, and then a layer of customization on top of it for the KDE hobbyists (with successful experiments integrated into the gnome-layer).
I'm all for diversity of desktop environments, but there needs to be a common core (especially since linux is driven by open source development)