I believe there are plans to make Ch. 9 available on at least some PMCO aircraft.

However, it doesn't make much sense to me for the airline to make it available on CO aircraft when an apparently considerable number of UA pilots currently keep it turned off. I also wonder if the CO pilots will even turn it on to begin with if it does become available.

Good buddy of mine who is UA 757/767 Capt. still makes sure Ch.9 is on because he knows many passengers like it (he frequently flies LAX-HNL/OGG/KOA/LIH and also the LAX-JFK p.s. service). But it appears he may be one of a dwindling number of pilots to do so.