Carowinds has room to expand. They can reclaim a large portion of the parking lot. Parts of it are rarely used. (They did this for Intimidator.) Also, They will have Dinos Alive area, RRR area to expand once those areas are cleared.
On top of that they have purchased land around the park recently so I am not quite sure what you are so freaked out about. They will continue adding new rides. They only rides I could forsee going in the near future are Vortex, PVZ, YOYO, and possibly Nighthawk. The GP love Nighthawk so that one is less likely.