The virus will always be here, we cannot hide forever, we must find a way to cure it or reduce its biological effect. Once covid19 goes away (if ever), and a new virus appears, NO ONE will have that app turned on, and by then, the new virus will have spread just like covid19.
I have a very simple solution to win time : total confinement of people of more than 60 years old when a new virus is detected, and wash hands.
Also check hemo2life, which is an example of what we could do in terms of medicine