I'm not saying you're wrong, but:
|Gtk2||13 Feb 2009|
|QtGui||4 Feb 2008|
|Tk||18 Dec 2007|
|Win32::GUI||13 Feb 2008|
|Wx||6 Dec 2008|
Are there issues with some of these? Yes. I use Tk and Gtk2, and those both work very well for me. Qt gave me issues when I tried to install it. I'm on Linux, so I can't speak for Win32::GUI. Could these libraries be updated more frequently? Sure, except maybe Gtk2. But years? Not exactly.
Yes, there's a reason why GUI code hasn't been updated as much as we would like. It's because people are working on these projects in their spare time. It's because Web gets all the glory right now for most new projects - in any language, really. It's because there's no point improving the Perl GUI libraries since everybody already knows "Perl really doesn't do GUI very well."
I'm not saying you're wrong on every point, but you're not exactly right either.