a) There are people who think this sort of thing can be maintained more than a few months. The economic ramifications of that, not to mention the domino effect collateral damage, will be a vision of hell unlike the world has ever known.
b) see my post in the When will the beaches open? thread.
We are dealing with a globalized world and a global economy where everyone is dealing with this at the same time. That is the aspect that is unprecedented. The wrong decisions can have very, very bad results.
But claims that this will last "forever" and that "people will die from hunger" are proposterous.
As well as "loss of constitutional freedoms".