I didn't want to double post in the wishlist thread again, so I revived a relatively dead thread so I could make this.
My concept for what I think should replace Nighthawk is a B&M Dive Coaster named "Vulture".
Heavily inspired by Banshee at Kings Island, the theme for Vulture is this:
At the center of the Carowinds lies a decrepit chapel, surrounded by the graves of past attractions. The Nighthawk has fallen, and a new bird has come to feast on its remains. However, this buzzard is no ordinary scavenger.
Perched at 223 feet, Vulture plunges riders 24 stories straight down and into the tomb of the Nighthawk, emerging from beneath the ground at speeds in excess of 80 miles per hour. Midway through the ride. Vulture gives its victims a brief reprieve before heading into the world's first wingover-drop on a dive coaster, and into a second half full of demented twists and turns.
Take the plunge on the world's tallest, fastest, and longest dive coaster.
Guests enter the queue line through a cemetery, much like the "Haunted Hill" entrance for Banshee.
Vulture makes use of Nighthawk's old queue line, but it is lined with tombstones of past attractions and easter eggs for fans.
The station is an old chapel. It makes use of the structure of Nighthawk's old station, but with a different facade and a double-load station. The station is also connected to the ride's storage area:
The lift hill and drop is similar to Yukon Striker, a 223 foot height with a 245 foot drop into a tunnel.
Just above the tunnel entrance is a giant tombstone dedicated to Nighthawk.
At night, it glows bright red:
It follows the dive coaster formula with a giant immelmann:
Next, it heads into a wingover drop right above the queue for Skytower:
The next element is a zero-g roll directly beneath the second drop:
It rises up into an airtime hill above the lake:
Vulture circles around the entry plaza like its namesake bird does above its prey:
The final element is a heartline roll which positions riders directly above the lake:
The ride would be positioned like this:Imgur Link
Here's a video of the ride, including an off-ride POV, and a day and night POV: