I believe they should because it would add a new perspective in the game , but only for PvE not PvP . Over all I Destiny would be a pretty new experience if you had the ability to swap from 1st POV to 3rd . Just an idea that bungie should add for the 3rd person lovers out there :)
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Maybe not 3rd person, maybe more of a Over The Shoulder like the Ghost Recon games.