My thought is that lets say you always play with 1 or 2 friends. All play a different class. You just want to kill some time, so you run some strikes. The Titan of the group gets the cloak of taniks, but the hunter has been grinding for 2 weeks for it. So in the end game rewards with friends that you have been friends with for maybe 2+ weeks (to prevent people just giving all of their loot to randoms). That way your friend is happy and you are happy to help them out.
There should be a trading system but it needs some restrictions.
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I actually enjoy this much more than I thought, this is a better system than before hand, and I would suggest that if this is to become a functioning system of destiny than you should prerequisites like you said with 2 weeks friends, i think there must be a fireteam, but i also think that the loot would have to be reward screen, not boss drop, so they would have to change that