Well, we also need to be looking into how far it is practical and reasonable to go. Perhaps a full lockdown could reduce the number of cases, but, given the enormous collateral damage it causes, can it be a sustainable option? No way. The combination of those and their effects might eventually end up killing far more people than the virus.
Masks are a reasonable compromise between enhancing safety and keeping the world going. And a sustainable one. However, they will only work if their wearing is enforced properly. It should be as non-negotiable as emptying your pockets at security.
And, for those craving an empty middle seat, Eurowings have got the right fix for that. They offer an option to book the middle seat at a reduced cost (i.e. the air fare only, without all the handling fees and taxes which would be part of the ticket price for a passenger but would not go to the airline). In this way, whoever is concerned with sitting next to a stranger can alleviate their concerns at a not-so-large extra cost - and the airline is not flying with a number of unsold seats which can only pave the road towards insolvency.