The exit cretiera is pretty clear to me, which is no new infections for 14 days.
I'm not sure that we can build a health system capable of handling this a second time... I have the feeling that this will just result in the way people work changing.
Essential workers taking more power because we are all forced to acknowledge that they're essential. People able to work remotely doing that much much more. Wearing masks at the grocery. These are things I expect to be long-term, except for the first which has some obvious structural barriers.