Green's has potential for pretty hard, high quality, but I doubt anything close to 5.15. I'm not sure if Bill Clinton will go. There is a bulbous overhang low down that is pretty blank and may require a move like lifting a giant barrel in your arms while reclining.
I started bolting a line at Waimea years ago that continues straight up from the start of Dodge The Lemons, but I am not strong enough to even trust myself bolting it anymore. I wouldn't be close enough to doing the moves to make sure the clips were right. It will require somebody with very strong fingers and the new routing skills to thread that gray line of cleaning since it will require some loose choss removed and maybe some reinforcement.
I wonder if there could be a hard line just left of Away in the Wilderness at the Painted walls?
Unfortunately, we don't really have cliffs with those long steep lines like they are finding in Spain, so our new hard lines will most likely be really bouldery power problems. I haven't checked out much up north and east of North Conway. Maybe there is some long hard steep potential there.
We do have TONS of potential in the 12 to low 14 range though, so at least most of us will remain challenged for a long time.