Something I would love to see implemented into Destiny is the ability give a kinetic primary elemental damage. I think the best way to do this would be to have an upgrade material that allows for this, the item to do this could be a raid/nightfall drop (possibly exotic rarety?), this could be dropped from the new and old raids (a way to make people still want to run the old raids).
I would like to see this because I would like the guns that I take the time re-rolling (please tell me reforging is staying in TTK) to fit my play style, be more viable in the higher difficulty PVE missions. The main reason that guns like Fatebringer and Vision of Confluence dominated the end game material so much was because of their elemental damage. Pretty much in PVE once you got an elemental primary, all other primaries became your PVP guns. If they want us exploring all the different guns in the game, this is a way to allow for us to use all of our favorite guns in all activities of the game.
This would also ease the burn for those upset about losing their guns.
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To add to the upgrade idea, the material could be found from dismantling elemental primaries we already own. Part of that sacrificing our weapons for materials to upgrade our current weapons they spoke of.