Nope. It'll never happen. The standard needs to fit all kinds of environments and will never include GUIs or testing frameworks.
I would not say never... Looking at the new C++ which now includes <filesystem> or <thread>... Several years ago somebody would also say it will be never part of the standard since this functionality is platform depended...
But I agree - the chances are really slim to ever see it as a part of the standard.
All problems in computer science can be solved by another level of indirection,
except for the problem of too many layers of indirection.
– David J. Wheeler