And the curve is now going straight back up at exponential rates. The lockdown should have lasted until we had a vaccine. Period.
Can people really go 18 months with no employment? Can students miss 18 months of schooling? Can people go 18 months without other medical care? Can housing go 18 months without upkeep because the landlords have no money since they can't evict rent nonpayers?
A lockdown that extended is not feasible, even before you get to any discretionary economic activity.
Prolonged lockdowns have costs too, it's just not politically correct to compare them to peoples' lives so people like to ignore them.