The premise is wrong. Plenty of native code is being written, just not by "app" writers. The UX domain has been ceded to interpreted/managed environments (with a few holdouts: ObjC apps on iOS being the biggest one) and it isn't coming back.

But under those apps sits a huge middleware, system management, driver, kernel and firmware stack. This world is very much alive. It's just a well-developed field without a lot of innovation happening in its tools. System s programmers don't spend a lot of time writing about the super-cool new environment of the week.