It doesn't necessarily mean they're going to migrate from C, building a C project is just so much nicer with Zig than fiddling around with CMake. You got people using it as a build system even for Go projects, especially if they're relying on CGo.

However, if you were entertaining the idea of slowly switching to Zig, the build system would be the place to start. Moving away from CMake is worth it even if you don't push it further.

But yeah, the C-Zig interop story is so good it's a no brainer if you want to "modernize" your C codebase, and you can do so incrementally instead of stopping the world for a rewrite.