It seems like these actions taken by governments will ultimately be futile, so the question is: can a vaccine or effective antiviral be developed fast enough to be worth the ~2-4 months of "slow spread" that can be bought in exchange for the economic and social slowdowns a country will sustain by creating massive quarantines like this?
While an authoritarian government may be better suited to positively addressing some very specific problems (such as a pandemic), I do not personally consider the benefits to be worth the costs of infringing on everyone's freedoms. A government built around liberty and individual rights simply cannot enforce a sufficiently useful quarantine here to contain something approximately as infectious as the flu.
Even China, which has severely curbed the spread of the coronavirus at tremendous expense, is still dealing with an exponential decay of new cases, at best. At the current rate (and assuming no incoming infections from abroad), it could take China a full year to go 14 days with no new cases. And if they let up restrictions sooner than that, perhaps they will lose ground to the virus once more. It does not seem sustainable.
Also note that most cases are not being tested and reported. Anecdotally, I have second degree connections who are mildly infected and being responsible (although still probably exposing some people who live near them), but see no point of getting tested because they don't need the hospital and it's just an extra trip out in public. Other seemingly sick people are out and about in the city in which I live, coughing without covering their mouths in busy areas, etc. Perhaps I am just noticing it more, but I suspect the official case numbers are still off by a factor of 10 or more, so considering roughly a million people are likely infected throughout the world, containment is a fantasy at this point.