That would be really cool, we could have more Enemy race NPC's like Variks who help equip us and eventually teach us a new subclass according to what class we are. They could introduce new social spaces, one for Hunters one for Warlocks and one for Titans. The hunters would get like a fallen ketch to explore maybe Variks brings back the house of Judgement and starts recruiting and teaching hunters the ways of fallen. The warlocks could get an expanded version of the lighthouse on Mercury with reformed vex and disciples of Osiris where they get new vex gear and a new subclass. And then maybe a new social zone on Phobos opens up for Titans to meet with a faction of cabal that split off from the empire.