Will the JSON be still used in 30 years later? The answer is maybe. We don't know. For a programming language like Java which is used in really serious places

Will the JSON be still used in 30 years later? The answer is maybe. We don't know. For a programming language like Java which is used in really serious places like banks, medical equipment, and all systems which last more than 30 years from now on, it can't remove the feature once added because it break the existing code. So the it's reasonable for the Java to be conservative at adding a feature just because it's trending right now.