The feature list of the language is so long at this point that it is pretty much impossible for anyone new to learn C++ and grok the design decisions anymore.

Even if it is possible, it’s a high bar. The height of that bar matters in bringing new people in.

I have seen decades of would-be “C++ killers” come and go. I think that in the end, it is C++ that kills C++. The language has just become unusably large. And that’s one thing that cannot be fixed by extending the language.