have heard immunity to the point where everyone new won't be getting the virus immediately. Take New York for example. What is the spread in New York? Has 30% of New York City already had the virus? (we don't know, we can only speculate)
I also believe the summer will play a role in this virus not being as deadly. While there is no hard data to prove this, summer brings an end to the flu and other respiratory illnesses usually are lessened in the summer.
I certainly could be wrong and am not a medical expert. But I have read a lot of what the medical experts are saying and studied the yield curves. I also believe that society will realize that staying inside forever (until we have a vaccine in this case) is not a practical measure.