I'd rather go forward in the pursuit of surround technology, not backward. Leave matrixed audio to the Dolby Surround days. Object oriented surround is definitely a leap in the positive direction. With correct implementation, it can be added to the UHD specs. and we can all benefit.
For folks like Noah and myself, this isn't an absolutist all (discrete) or nothing proposition. Like him, I'd be fine with additional speaker feeds that were matrix derived, considering the alternative is not having those additional speakers at all.
And by matrix derived, I don't mean "the Dolby Surround days". You make it sound asthough surround processing technology has remained absolutely still over the last three decades. Mike's brief experience with the Neo:X demo disc demonstrates otherwise (the additional channels sounded discrete to him).