I would be. Mostly because while Zig is better than C, it doesn't really provide all that much benefit, if you already have Rust.

IMHO Zig doesn't bring enough value of its own to be worth bearing the cost of another language in the kernel.

Rust is different because it both:

- significantly improve the security of the kernel by removing the nastiest class of security vulnerabilities.

- And reduce cognitive burden for contributors by allowing to encode in thr typesystem the invariants that must be upheld.

That doesn't mean Zig is a bad language for a particular project, just that it's not worth adding to an already massive project like the Linux kernel. (Especially a project that already have two languages, C and now Rust).