As for Cabin Crew, yes they have changed too. No longer employed as a Mess Steward, they are all contractors in Messes these days, they are employed primarily as Cabin Crew now and have become an essential part of the Voyager and 146 capabilities. The WSOp (ME) ALM still act as the senior supervisor off of the flight deck, as a Chief Purser on the Voyager, working with the rest of the crew - Pilots and Cabin Crew. Then some of the WSO/WSOp (ME) also conduct the Mission Systems Operator (MSO) on the Voyager too - running the fuel plan on AAR and the kit on the Voyager, again splitting the legacy tasks of the Nav and Air Eng with the Co-Pilot.
Almost correct, personnel from the Air Ground Steward trade (cabin crew) are still employed in messes, on MSCU and a couple of other ground roles, but over the next few years the number of ground posts will reduce but not disappear altogether.
All WSOp (NCA) are qualified in both MSO and Purser roles on the Voyager, the MSO role takes primacy and the vast majority of their time is spent as an MSO on AAR tasks than as a Purser conducting AT.