Plans seem to indicate most of the planting is RPA mitigation, so erosion protection for the slopes and edges. Doubtful to me that the flat fields ever had anything planned.
LNM isn't so much rough as it has extremely uncomfortable seating especially for taller body types, where you will just slide and slam into hard edges as the trains lurch through old arrow turns. The actual setup of the seatback and seat never agreed with me either. I always hoped someone...
With the change in terrain grade it would have easily been a greater valley-to-peak "height" than the literal ground-to-peak that the permit process involves. I expect it is or was in the upper 300's and I'd have wagered the very marketable speed of 100 miles per hour.
If this is of a different type of ride, the question is what is the goal of the attraction if not to go for those hyper-marketable size/speed features. Another question is if/how the budget is being renegotiated.