From someone studying in engineering I don’t really like the “service life” debate. There are so many factors as to how long a coaster can last. Corkscrew is nearing 50 years, but Orient Express barely hit 20. Viper is still going, but Shockwave only lasted about a decade and a half. I think if a park wants to keep a coaster going, they will. Look at Vampire and Chessington WOA. It was having problems, but they change the trains. Steel is a pretty strong material, so a well-designed coaster should be able to last forever (figuratively) given the right maintenance. Look at Matterhorn. It’s the oldest tubular steel coaster yet it is still up and kicking. Only 2 B&Ms have closed and it was because of expansion and not overuse. If I had to put a time, given the parks that still have suspended coasters, I think 35-40 years is their “service life” because big Cedar Fair parks and Magic Mountain take pride in their coasters. Given Bat’s problems, I think it would’ve closed right around the time Cedar Fair took over. Potentially Firehawk finds a new home in Vortex’s plot in a head cannon?