Cores are only an issue for people who REFUSE to adapt to an in game economy and make wise decisions. There are currently so many ways to earn cores without actually grinding for them, and another huge source is being introduced. If the gunsmith works like every other vendor, that 5 guaranteed cores per day, per character, another 2 per week per character. In addition, the mod component reward will relieve the stress of gunsmith mats turning into mod components, which will allow you to turn them into gun for yet more cores from dismantles. At this point, the community is just as stubborn for shouting and whining “remove cores waaaahhhhh” without even trying the new system, as Bungie is for not removing them from infusion.