Definitely. Not now, obviously, as Bungie's got a lot on their plates and a lot of plans already no doubt. But in the future as a new type of event. Not like public events, but more like the upcoming Wrath of the Queen event. A special event that you can join from the tower that lasts for a week or two. Like someone else said, with periodic bosses for players to team up against regardless of fireteam, and with special full on missions to accomplish that help defend the city. And it doesn't necessarily just have to be the city. Like say the Vex decide to strike the Hive on the Moon, or the Fallen House of Kings and Fallen House of Devils start going at it on Earth, vying against each other for the Cosmodrome. Same thing. A full on war between factions with special missions, periodic bosses, and that you can join from the tower. Finally, these events need to have unique loot to them (or higher loot drop rate), and there needs to be some change in the game to show that they're going on. Like if something's invading the City then maybe there are refugee seeking shelter in Tower, or if say it's like the Fallen fight I just suggested then when you go to the Cosmodrome you can see the two factions fighting each other even outside of the event, like how the Fallen normally clash with the Hive.