I'd have to implement a real time system for over-time enemy respawns. I've thought about it many times, specifically for herb respawns.
The thing is, for people willing to grind, almost all RPGs eventually fall victim to low difficulty. There is the issue of no other areas being released for now so you have no incentive to hurry away from an area anyway, but I don't think there will ever be a final solution to balancing the game for grinders. The only way would be scaling enemies which I absolutely hate when I see it in games like Bethesda's, and I don't want the world to feel too empty with non-respawning mobs, other than the most aggressive ones like the kobolds.