Are just the ERs empty? Or the whole hospital as well? If hospitals are empty, it's time to stop sheltering in place, because it means it's working too well . What's the endgame? We can't just keep the country shut down indefinitely. Life must move on. Even though there's still a lot of fear, I think reopening the country is the best option (while still maintaining social distancing, etc).
So, generally, they're less busy than normal.
The problem with opening back up is, we've already seen the growth curve, and that was 2 months ago.
What happens when you multiple that same growth rate against a much higher baseline number of infected people?