Just curious, as teachers (students feel free to answer also) are there materials for teaching or learning that you wish were available but aren't? Could be certain types of repertoire, exercises, method books etc.
Personally, I would like to see more contemporary repertoire aimed at absolute beginners.
Also (and perhaps this already exists but I just haven't found it), I wish there was a theory book with integrated, structured and progressive piano exercises, a sort of "practical" music theory book.