[pjmlp]

No language can become an alternative to C in the context of UNIX like OS because no one is going to re-write them from scratch, given their symbiotic nature.

Even if the complete userspace of Aix, HP-UX, *BSD, GNU/Linux, OS X, iOS, Solaris,.... gets re-writen in something else, there will always be the kernel written in C.

Hence why improving C's lack of safety is so important to get a proper IT stack.