We cannot just lockdown and “none of this is necessary.” There is no scenario short of locking down for 10 years that would be able to manage with the number of critical beds we actually have. We need to dramatically upscale capacity (which means training new doctors) and quarantine.
It cannot be an either/or.
The problem is, developing and testing a vaccine takes some time. How much time do we have before the global economy totally collapses?
Based on what? It’s been more than 10 since SARS and we still don’t have a vaccine. I think you’re making a lot of assumptions about immunization when it is far, far too early to know. Also, the point is that we don’t want to be quarantined for 10 years, we want to build the capacity now.