Kings Island will remove whatever ride in the future that they deem necessary. Maintenance costs, the rides popularity in terms of ridership, its marketability, operating costs, and other things are all factors in what rides are removed from parks. I`m sure that if KI has a ride or rides that they are thinking about removing, they likely have plans in place to replace said rides. That being said, there is no reason to want rides removed simply for the sake of no longer having them in the park. Some people may not like certain rides, but other people love them.
The Racer never has a real line, and most of the time the blue is not on the track. I hope they never get rid of it. I love it. It is my favorite ride.