Make etheric light into a weapon consumable that allows weapons from year one to move into year 2 starting at 179, but only upgradable with etheric light, and etheric light only raises the item by 10light levels, or can "crit" for 20. That or just as an item that brings up any and all items by 10 light until 280, 5 until 200, 2 until 210, and 1 after that. This way it has a purpose and gives us a reason to go back and get it. Also make it so it can drop from the raids or rare weapon engrams with weapon parts. No reason to leave it useless, and then we can bring our year one weapons forward, but at a slower rate, allowing us to work hard to bring our old gear up to date. All items from year one have an etheric light slot, so why not?