It's a long shot, but I hope that they keep the exposure notification framework and work with the CDC/appropriate orgs around the world to make it a generic exposure notification. The technical feature is impressive, and the usefulness (with proper adoption) would be high for the various occasions where other communicable diseases pop up. It seems easy enough to have a generic app to add the various diseases and their incubation/transmission windows to allow others to be notified.

But, because people are whiny fucks, it'll die and we'll be in a rush to reimplement it for the next thing that comes up.

Even if it did exist in an ideal state, people would still not use it, because people suck.