I have now composed a list of solutions for preventing Iris' death. 1. Use the face scanning technology to make everyone look like Iris 2. Have a character make a sacrifice and use the face scanning technology to take her place maybe Killer Frost since they'll probably have to kill her anyways 3. Have Martian Manhunter take her place. 4. Use an alternate universe version who may have meta abilities 5. Keep Iris in an alternate reality until the date passes. 6. Take a cue from the comics have Barry make a time paradox duplicate and have him and Iris live the rest of their life in the future. Six just came up with six solutions to this in half the time these "super scientists" have besides just changing random events that are clearly meaningless!