I'm beginning to think their reasoning not to produce a 50th DA set is a combination of a couple things:
(1) Lack of ability to bling-up black components; It's boring to even look at the R9720 "group" on-line.
(2) The decimation of the true groupset--A boxed set containing Shifters, Derailleurs; disc brake calipers, discs and a crankset is pretty boring. Being virtually all black doesn't help. See (1) above.