To have blindly "re-opened for business" in the Northeast (NJ, NY, CT, MA) on April 15th would have been a disaster -- the numbers of infected would have zoomed upwards again. Mr. Trump was wise to change his mind about this.
New infections are still trending upwards here in Connecticut, even under "stay at home" orders. They need to peak and plateau, and then start dropping down, before there can realistically be "an opening" again.
The stay-at-home orders just got extended here until May 20th or thereabouts. With a bit of luck (that "downward curve" arriving early), they could be rescinded earlier.
It looks like new infections are peaking in NYC, perhaps they're getting "to the plateau" soon.
But the situation here doesn't parallel with that in, say, North Dakota or even northern Vermont.
So... "re-opening for business" is NOT going to be an "all-at-once" event.
It will need to be regionalized, perhaps even localized in some states (again New York is a good example, as the upstate/western areas have never been as highly infected as the NYC/suburbs region).
And we need to begin "antibody testing" as quickly as that can get into mass-production.
There is no vaccine yet.
But what there CAN be is a way to identify who has already had the disease -- and, thus, who now has antibodies and as such is no longer a danger to those who remain UN-infected.