I'd like to echo the points stated here. Having been on the shard for just shy of 11 months, I have never once thought, "boy, am I glad that person is able to publicly self-sooth in PVP chat". It provides no positive impact on game play and has been the source of many, many avoidable situations.
Regional global chat would also be a welcome system to give a test run and would go hand-in-hand with no PVP chat. Many of us want to encourage player-player interactions, but as it stands, the chat system reduces the need to be in proximity of any other player. Needing to be in the same region will be a step in encouraging a closer knit community.