How long will it be before the majority of GTK2 apps move to GTK3?

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http://ubuntuforums.org – I am really loving Gnome3. I know there are themes that include both GTK2 and GTK3 versions but i do really like the default Adwaita theme. Anyone know when programmes are likely to move on to GTK3? Also what about Firefox and Libreoffice integrating? I know they aren't GTK but with GTK2 they did fit in really well. Also really loving the mock ups of Gnome over the last while. Can't wait til it's well and truely underway. Anyone have any idea on when GTK3 will become the norm? (Hardware)