Then who would do it?
With all the land that PKI has that is yet undeveloped, and the fact that they want to go with a Hollywood theme, there are easier options than removing any ride, with a good theme.
PKI will eventually have to develop land around the park, and the erosion idea is a great thought. Chances are, the creek was modified when TG was put in, and again when SoB was put in. If there is another large coaster planned for PKI, they would have to submit proper paperwork concerning the creek to the EPA, that the modifications did not have long term effects to the creek, if they are putting the coaster (or another ride) in that general area.