Here's the predicament, though - every ride is, invariably, on the chopping block. It's all just a matter of when. So, when
@Brian G. provides information with the additional advise to "make peace" with the time frame, he's actually telling you "Get over something that should have already been expected." Universal replaces its rides. It does that because 1) space is limited and 2) their rides hew more advanced, third-party builds. A lot of Disney's older rides (since that was brought up as a comparison) are developed in house, so Disney actually has the ability to continue manufacturing replacement parts as long as they want. Universal doesn't have that, so when a ride system nears the end of its life-cycle (anywhere from 20-30 years of continuous use), they have to consider replacing it before it becomes too risky to continue running.
KidZone, for all of its faults, doesn't require expensive replacement parts to continue running. The playground was built entirely in house, the coaster is a still supported, off-the-shelf attraction, and the show is a show. Apart from the relevance of the IPs (which isn't a huge factor), there is no external reason forcing its replacement. With Mummy, there is. It's an old, complicated ride system.
So, Brian can respond with "get over it," because emotional, knee-jerk, short-sighted responses to inevitable ride closures (that are still half a decade away), aren't actually helpful. I get it. You enjoy the ride. It sucks when a favorite attraction closes (it's happened to me a few times). But it's going to happen eventually, whether you like it or not. So make peace with it, and start thinking about what they can do to replace it.
Personally, I elect they build that "thesis" ride that's a Universal version of the Great Movie ride.