Qt is currently probably the best multiplatform native GUI (and non-GUI) toolkit. IMO it got into that position especially because it was always well-funded (vi

Qt is currently probably the best multiplatform native GUI (and non-GUI) toolkit. IMO it got into that position especially because it was always well-funded (via Troll Tech and later Nokia). If Nokia dropped Qt development completely and Digia wouldn't pick up the slack, the pace of development would probably at least be comparable to Gtk+ and wxWidgets, given that Qt is very widely used (from KDE to closed-source software). tl;dr: Qt is very much ahead of Gtk+ and wxWidgets, progress will, at worst, be comparable to that of Gtk+ and wxWidgets.