Schoenberg gave the scale some decent discussion in his Harmonielehre in the section on the major mode and diatonic chords. Overall, he was liberal and encourag

Schoenberg gave the scale some decent discussion in his Harmonielehre in the section on the major mode and diatonic chords. Overall, he was liberal and encouraging about the directions that music could go, and he led by example in producing his own compositions in his own way. "And above all; this scale is not the last word, the ultimate goal of music, but rather a provisional stopping place. ... Whether there will then be quarter tones, eighth, third, or (as Busoni thinks) sixth tones, or whether we will move directly to a 53-tone scale that Dr. Robert Neumann has calculated, we cannot foretell. Perhaps this new division of the octave will even be untempered and will not have much left over in common with our scale. ... Probably, whenever the ear and imagination have matured enough for such music, the scale and the instruments will all at once be available." I'd say that last prediction was very prescient!