English spelling
Between the [[Great Vowel Shift]] in the 8th century [[Before Fusion]] and the [[World Language Unification]] in the mid-1st century [[After Fusion]], English spelling had an infamously inconsistent relation to its phonology. Although the worldwide reach of the [[British Empire]] first, and the [[United States of the World]] afterwards contributed to English being the de facto lingua franca of all humankind, its unpredictable spelling was always a major obstacle to universal learning of the language. [[World Assembly Resolution 5429]] created the [[Revised Hangul Alphabet]] for use in all human languages, giving a long-due solution to a centuries-long problem.
Speculation is important for forecasting; it's also fun. Speculation is usually conveyed in two forms: in the form of an argument, or encapsulated in fiction; each has their advantages, but both tend to be time-consuming. Presenting speculation in the form of an argument involves researching relevant background and formulating logical arguments. Presenting speculation in the form of fiction requires world-building and storytelling skills, but it can quickly give the reader an impression of the "big picture" implications of the speculation; this can be more effective at establishing the "emotional plausibility" of the speculation.
I suggest a storytelling medium which can combine attributes of both arguments and fiction, but requires less work than either. That is the "wikipedia article from the future." Fiction written by inexperienced sci-fi writers tends to generate into a speculative encyclopedia anyways--why not just admit that you want to write an encyclopedia in the first place? Post your "Wikipedia articles from the future" below.