I expect resort hotel and park decisions are exclusive of one another. Each has its own labor and operating costs to balance.
Currently, ~55% of cash room inventory is open for business. None of us know who much of that is sold, but I guess the room inventory would need to approach consistently 80-100% pre-sold to justify staffing up another resort in a price category.
The parks will increase capacity whenever and however they deem they can increase it safely and in a way to maximize revenue to break even.
That said, all this speculation is probably better off in the Rumors section.