It's a reasonable approach. Let's hope Cuomo retains the ability to block NYC full lockdown (which is physically unenforceable and would have at best a marginal impact).

Facebook and Google sometimes use the expression "one in a million" to describe edge/exception cases which occur every day when you serve many users. The density of NYC is a real-world equivalent, there are continuous exceptions that cannot be centrally predicted and must be micro-locally responded.

There has to be non-zero social interaction of young people who are least at risk, and can recover most quickly. Otherwise the only people being exposed will be essential workers. After recovery, these young people can volunteer to train/run errands for hospitals, reducing load on the system and keeping them active.

In times of crisis, civilians working with each other can make a difference. Wish they had used the language "physical distancing" since people can still coordinate socially (including online).