The goal rather explicitly seems to be to extinguish it - the idea being that if you've got Zig, there should be no reason to need to write new code in C, becau

The goal rather explicitly seems to be to extinguish it - the idea being that if you've got Zig, there should be no reason to need to write new code in C, because literally anything possible in C should be possible (and ideally done better) in Zig. Whether that ends up happening is obviously yet to be seen; as it stands there are plenty of Zig codebases with C in the mix. The idea, though, is that there shouldn't be anything stopping a programmer from replacing that C with Zig, and the two languages only coexist for the purpose of allowing that replacement to be gradual.