The death or rise of UI toolkits?
Back in the days of PCs and workstations we first had some platform specific UI libs, and then X11, Motif, Gtk+ Qt, Fltk, Fox etc. pp.
Mostly because people were tired of non-portable UI code, having to rewrite most of the App for each and every platform.
And today? Most devs are back to using platform specific code for UIKit, Android, WP8, … insanely sad :-/ Ok, they mostly just instantiate a WebView anyway, … ;-)