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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Actually as long as they keep it mass effect esque I don't think it's be a bad idea in PvP. It'll pull the camera back but give you the same peripherals give or take. As a PvP'r and a high ranked one at that, I think most of us would take that with open arms. I'm all for it dude.