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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That would be a cool like public event type situation however theres a couple problems... 1. The tower is in the middle of the only SAFE city on earth. Meaning that theres no enemies in the city so It wouldnt really make sense for enemies to show up there. 2. You go third person in the tower