Not gonna lie, as someone who spent a lot, lot, lot of time at the park growing up in the '90s (my first-ever coaster was Revolution), the day(s) Ninja and Gold Rusher go away will be a huge bummer, just like Log Jammer and Tidal Wave were. I have so much nostalgia for both rides, and even if they make way for stuff that's better, I'll still miss 'em because they were part of what defined "my" childhood era of the park, one of being excited for the Batman stunt show or feeding the goats at Critter Canyon or being terrified of Freefall or wondering why Flashback was always so damn loud.
Conversely, Viper could close and I'd actually breathe a sigh of relief.