Making any changes to the core language is a sensitive thing as it inevitably imposes new demands on compilers, a learning curve for all users of the language, and risks breaking compatibility and introducing unforeseen issues that will need to be fixed with future changes to the language.
Personally, I'd much prefer a smaller and more stable language.
Leaving curve can decrease as a result of better design, same re. the chance of those unforeseen issues (and it can even decrease the chance of existing bugs popping up)
Personally, I'd much prefer a smaller and more stable language.