That's certainly possible, though I feel as though with the way it's been set up, the cursed land is likely going to be as big as I said. I also think that the mountain pass is be its own seperate small area consisting mainly of the creche and some interstitial area. That one will probably be smaller than Grymforge if I had to guess. It also doesn't entirely make sense for the cursed land to be as small as only grymforge. I expect Moonrise tower itself to at least be as big as grymforge since it would be a wasted opportunity to not make that place the end of act dungeon.