That's the thing with Bungie. They know that Escalation Protocol from D2, Court of Oryx and Archon's Forge from D1 were fun popular activities that people would like to see inD2(but on new destinations) but Bungie are too stupid to realize this. I have always thought that the Witch Queen expansion should've had a Court of Oryx activity that could've taken place on Savathun's ship where you fight the first hive guardian in the first mission. An Escalation Protocol mode in the Moth yards or Forgotten Shore areas of the Cosmodrome would be cool too.