I think it will give everyone something to work on, and give them a reason to play a bit more .

Having the option of grinding for the Relic/Eurekan weapon released at the same time of the new Raid wing would definitely increase activity.

To balance it, Dev's can initially make the requirements for completing the Relic/Eurekan weapons Incredibly high. Like 10,000 Pagos Crystals and 250 lights. Then reduce it each patch.