If it does indeed turn out to be useless (which is far from obvious at the moment), it'll be dropped, and not much money will have been spent. It's unfortunate

If it does indeed turn out to be useless (which is far from obvious at the moment), it'll be dropped, and not much money will have been spent. It's unfortunate, but a lot of what we're trying right now will turn out to be useless. One or two recent analyses suggest that the (far more expensive) lockdowns might turn out to have been almost useless. That doesn't mean that trying them was the wrong thing to do. We're living in unusually uncertain times.