Top Gun is in no need to be torn down. If memory serves me correctly as well, the area it's in isn't the ideal place to build something new.
Top Gun still draws crowds, and still pleases riders. It's a great ride for kids who aren't quite ready for something larger. It is still a very important ride to the park.
What riders are still pleased by Top Gun? Not me get rid of Top Gun Build a new 500ft coaster in it's place