The big question is how soon and how much. To soon or to much could really suck. It wouldn't take many carriers moving around to get the numbers going back up fast.
Blowing the call could easily cost tens of thousands of deaths or more. How any lives are you willing to gamble away. Remember that over 20% of the fatalities and 50% of those that go into an ICU are under 60. Plus, many of those that require ICU attention suffer from kidney damage and will need continued medical care and likely a shortened life span.
We know there are 600,000 infected right now. Probably at the very least 100,000 unknown infected and probably way more. Those unknowns are a big problem. What we have now in this country was started with far less.
We could test everyone. But, those tested would have to remain away from anyone else not known to be clear. As soon as they contact an unknown the validity of them being known to be uninfected is shot. How do you plan to do and control that? The antibody deal is good if the reliability of an antibody test specific for Corona 19 is validated and those with antibodies are proven to be immune to reinfection. Which is nowhere near the case yet. Like I said jumping the gun could cost lots of lives. Maybe yours or one of yours. Let me ask you this. Would you bet your kid's life on it. Not yours, but your kid's life? Sure it mostly kills the old with issues, but it get some young healthy people too? Would you risk your kids being exposed to it with no positive proof. I would not. Already lost one son and don't ever want to go through it again for any reason or amount of money.
I don't disagree with you on timing being very important. Obviously if they are going to use mass testing for antibodies as a guideline, it ain't gonna be tomorrow. Or next week for that matter. But we need to get started NOW!
In regards to your statement above, I'm not talking about testing looking for those who have never been infected. I'm talking about determining who has been infected and recovered and gained immunity. Once that has been determined there is no need to continue tracking that individual's status. They are free to get back to normal life. They just have to stay away from those who are vulnerable and don't already have immunity. Social distancing and things like masks in public couldn't hurt either.
Those who haven't been exposed and aren't immune would need to stay at home if they are in a high risk group. As long as only the immune are out there living normal life among the other immune members of society (and those young and healthy enough to risk catching it), and as long as those who aren't immune stay away from them, then both groups are safe. It may mean the older folks who haven't developed immunity, and those with compromised immune systems, have to stay shuttered away from everyone who has developed immunity for a while. But that beats the hell out of EVERYONE having to stay shuttered in their homes.
As for the risk to my kid. The latest stats for NY are more than 26 thousand confirmed cases and 7 deaths for kids under the age of 21. So 7/226,000 = .0031% chance of death for CONFIRMED cases. In 2018 there were 37,461 auto fatalities in the US out of 337 million people. 37,461/337,000,000 = .0112%
and we all know that a disproportionate number of auto fatalities are young drivers.
So every day I let him drive his car - even though the chances of him being killed in a car accident are three and a half times as high as him catching and dying of COVID-19 if we lived in
IN NEW YORK. The stats for NY are more than 20 TIMES worse than they are for my state (WA has less than 11k cases).
So yeah, I'll accept those odds rather than risk seeing him and everyone else in the whole country go through a depression like what we had in the 1930's. And make no mistake about it, that is where we are headed with this. Doing what we are doing now has us headed in that very direction. The effects of this shutdown are going to be felt for a LONG time. Possibly for decades, and the longer it drags on the worse it is going to get and the deeper the hole we have to try to get out of.
EDIT: Another glance at the NY stats show only 713 deaths for people under the age of 50. That is 713/266,000 confirmed cases so that is only a 0.26% chance of death for people under 50 years old. More significant, but still only about 2-1/2 times the risk of death by other strains of flu (0.1%).