Dropping toxic features from a language does happen at standards
committees, but it's rare. The best case I know of where this
happened was when the international standard for PL/I came out. They
started with IBM PL/I but then dropped a bunch of features that were
either obsolete (e.g., sterling pictures) or downright dangerous
(e.g., the DEFAULT statement).
That actually happened twice. The 1976 standard removed features from IBM PL/I; the 1981 Subset G standard removed even more features. (A few were added back in the 1987 revision of Subset G.)
On the other side of the spectrum you have the BASIC standards
committee. BASIC has always had to live down a reputation that it's a
"toy language" not suitable for "serious programming". The standards
committee seems to have suffered from an inferiority complex, and it
seemed from my perspective that as fast as the PL/I committee chucked
out toxic language, the BASIC committee adopted them.
There are two Basic standards as well: the smaller one came first.