As the title implies, please take Dungeons out of PvE.
There should be a zone like the Heart of the Mists with portals to every dungeon. It can be accessed via “dungeon entrances” in PvE – because there is no need to take these away anyway – or a “Dungeon icon” in the UI top left of screen similar to WvW and PvP icons.
In this way, people who want to do dungeons will meet in the same place as the people who like to sPvP or WvW.
Besides, this zone can be expanded with every new dungeon added to the game