I think you are missing the difference between languages used in 'web 2.0' style websites, and mirc scripting. It is simple, mirc scripting was created for the SOLE purpose of improving the irc experience, it has come a LOT futher than originally intended. Where as languages like ruby on rails, python, JAVA SCRIPT which is actually used for those particular style website much more often than the two you mentioned were NOT created to be used inside a single specific program.
If the change you suggest were to happen, then the very reason you want the change would no longer be valid. The language would become just like the others.