So is that a consensus among the Perl community?

No. It's my opinion. I think it's an informed opinion, but I don't want to put it forward as anything other than my informed opinion.

That Perl/Tk as a GUI programming language and is fragile?

I mean that I consider it fragile to install. It's a big, complicated project that has to do many complex things. I've seen some of how it does what it does. I don't know if I'd like the internals of SWT, Swing, or the .Net replacement for MFC any more either -- but being installed as part of the base package (or at least being installed as binaries) is a huge advantage.