Thanks for opening this thread Kalypso, a long overdue discussion indeed !
That being said, running rofl rather feels like a daylie grind nowadays instead of a fun instance-experience.
While I do like the idea of a hell mode, I think that additional content apart from rofl would be great. Hence I'd suggest implementing more nostalgia instances in the meantime.
Preferably Kulech Bone Nest, Veiled Crypt of Kashaylan, Belathis Fortress & Tomb of Seven Heroes. Each of this instances could drop one of the four non-rofl cores, which would reduce the overall amount of rofl runs needed for golden gear (assuming most players mainly downgrade their rofl cores for the others).