How do you envision this partial quarantine to work? Whos going to deliver food and groceries to the at-risk population? Are young/healthy people going to do all the work required by grocery stores, hospitals, gas stations, and utilities? Are all young/healthy people going to move out of their parents/grandparents' houses until this is all over? Where's everyone going to live?
Is it ok with you if businesses only employ young/healthy people temporarily - and then they lose their jobs when the older/at risk people get cleared to return to work?
The reason that the lockdowns are keeping rates down is because everyone is complying. If some people aren't required to comply, that increases the rate of new infections, and exposes everyone to increased risks.
Sorry but I just don't have the mentality to address problems with "how it can't work", I address problems with "how it can work". Again I find it a very odd mentality to look at the negative of everything and make it a zero sum game and not make it a win, win situation.Elementary kids will not wear masks all day, classrooms are very crowded and in some cases difficult for teacher to even move around, ask plant supervisors how the kids leave the bathrooms, ask a teacher how often they get sick from what the kids bring to school. Ask a teacher what it would be like to teach outside all day and have the students six feet apart. I am sure "Pediatricians" are all for it. Side note - if you suspect your child is depressed or has a mental illness, definitely seek the help of a mental health professional. Mental illness is a real problem in teenagers, our school district had 3-4 suicides last fall, so again seek professional help for your child regardless of age if you suspect mental illness.
The solution is easy. In its simplest sense we should do what we always done for the last 100 years and quarantine the sick and protect the vulnerable. Its not possible to eliminate all risk, nor should that ever be our goal. Our goal should be to mitigate risk on a cost/benefit basis. Cost in terms of health not dollars. First step, don't force nursing homes and other vulnerable communities to accept Covid patients. Vulnerable people should shelter in place and have very limited exposure to anyone else. If they're going to have exposure to other people, both should be wearing gloves and masks (preferably a N95 mask for the vulnerable since they're readily available now). Plus anyone that is going to have exposure to the person must have a temperature check. It's pretty simple. Please don't let your personal fear of Covid distort your common sense.
That having been said there is one thing that I'm concerned regarding fighting Covid and that is our current state of testing. Right now, at least in San Diego, it is very difficult to get a test if you have no symptoms. I could be wrong, but I believe its not due so much to a shortage of tests, but the ability to timely process the test. I believe its also because doctors are not that concerned about potential asymptomatic individuals. We had an employee who got Covid from their significant other and had direct contact with another employee. It was incredibly difficult to get that exposed, symptom free, employee a test and were still waiting on the results. I would like to see more available and timely testing for directly exposed but symptom free individuals. It's critical for decision making.