Exactly. No holy trinity means you play what you want to play. There's no targeted healing, no designated tank, just players and their skills. If you can keep yourself alive, put out some decent damage, and possibly toss up a shield or an ability that removes debuffs then you are doing well. It also holds each person a little more responsible for their own actions, but at the same time requires some good group coordination and hopefully some fun uses of cross class combos.
While I'm okay with the holy trinity and it obviously works, I am looking forward to something a little different. If implemented well I think it could become something that truly sells GW2 for me from the PvE side of things (not to mention Dynamic Events). WvWvW already has me sold on the PvP side.