How soon people forget the Great TCL War of 1994. TCL/Tk was vying for a web position well before Java.
Apparently, not a lot of people remember Sun's unilateral announcement that they were going to make TCL the official web scripting language. (I can't even find a link to, unfortunately.) It triggered RMS's "Why you should not use Tcl" response [1], and the ensuing flame war [2].
There was a huge debate about what the official scripting language would be for the web, after Sun hired John Ousterhout [3] and made its announcement that pissed off RMS.
RMS's position was that it should be Scheme, not TCL, of course.
What TCL/Tk had going for it was not the TCL language itself, but that it had a nice GUI system with its own "canvas", much better than anything Java or JavaScript had years later.
It didn't go so well, so Sun changed their mind and decided to de-emphasize TCL, and then tried to make Java the "official web scripting language". And everyone knows how that went.
[1] https://web.archive.org/web/20141028202423/http://www.vander...
[2] https://groups.google.com/forum/#!topic/comp.lang.tcl/7JXGt-...
[3] http://www.softpanorama.org/People/Ousterhout/index.shtml