Concepts, modules, a file system library, and an asynchronous I/O library have all been discussed as additions for C++17 and beyond. Most of these features are standard in modern languages. I would not consider any of these to be "scarcely useful." As someone who uses C++11 on a daily basis, I very much look forward to using these features without a Boost dependency.
That being said: I don't think that a graphics is a good addition to the standard library. It would tremendously difficult to standardize this for the reasons others have mentioned.
That being said: I don't think that a graphics is a good addition to the standard library. It would tremendously difficult to standardize this for the reasons others have mentioned.