You have to know that you're making a hugely stretch of an argument, I mean none of the "C replacement" languages really expect to replace C so completely that there will be no more C code written or no C compiler that runs on modern hardware in 20 years - you have to realise that's not what they mean by "replace".
It's meant as in "replace for the majority of modern use cases, where the power of C is needed, but a better language is desired" (or some variation thereof) and if it does come to it...meaning a language will replace C so completely that there'll be no C in sight in 20 years time, (hard to believe), then it'll probably be so, because we figured out how to not depend on C and go on without it.
I don't expect it, but if that's what you're shooting for, that's the sort of thing you've got to contend with.
And no, I don't know what they mean by replace, but if they make such a big point of stdlib not depending in cstdlib, what other conclusions am I supposed to draw?
It's meant as in "replace for the majority of modern use cases, where the power of C is needed, but a better language is desired" (or some variation thereof) and if it does come to it...meaning a language will replace C so completely that there'll be no C in sight in 20 years time, (hard to believe), then it'll probably be so, because we figured out how to not depend on C and go on without it.