Popular programming languages don't get replaced, even by something that's mostly a superset. C++ didn't mean the end of C. So I'd say stick with your plan, as

Popular programming languages don't get replaced, even by something that's mostly a superset. C++ didn't mean the end of C. So I'd say stick with your plan, as there is going to be Rust around for a long time. It's rather early to learn Zig, as it's not stable yet. It might be worth learning if you're curious and want to tinker.