Actually, there are almost 200 theme parks in the United States alone. Being in the top 50 is pretty sigificant, edging up to the top 25 is a big deal.
I actually used to work at Carowinds and have been going to the park since I was a kid. My first trip was in 1978, the park has indeed changed over the years.
The monorail currently services a Mexican resort community. White Lightning was sold to a Russian company which hoped to install it near St. Petersburg. When that flamed out, it was sold and installed in South Africa, which, to the best of my knowledge is where it still remains.
It was a maintanence nightmare, that's why it was sold. No one ever got seriously injured on it.