I'm not sure what's Apple plan here, as others have stated Swift will stay for the foreseeable future 'IOS language', and even if it is used internally, why not use Rust instead who provides a similar kind of safety and convenience, and is already much more used in embedded devices? Assuming the reason is to avoid using C/Cpp.
Given engineers' skills at Apple using Rust would not be an issue.
Given engineers' skills at Apple using Rust would not be an issue.