I think it would be cool if Hive tried to invade and everyone inside the tower gets there point of view changed to 1st Person and has too defend the tower. They can have this as a random event, would be fun to have at the tower. Bungie can even announce when it is going to happen, and that it is a one time event.
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YES! Hopefully the Gun smith would take a bullet to the head and we could replace him. Xur could also finally find a reason to use all those exotics we all know he's hoarding