I think it could work so long as you can only trade items of equal value. And that doesn't include strange coins for exotics or even exotic shards for exotics. You can only do exotic-exotic, legendary-legendary etc. Doing it that way I think it would work. You'd still need to put time into the game to get good quality items, and realistically you'd only trade exotics if you had spares. It would massively help with the frustration of getting your third or fourth vex, only needing one exotic, while others still don't have it after numerous raid clears. Just to be clear - NO, destiny doesn't currently have trading. It'd be nice for Bungie to add it though.