If the experts didn't think closing schools and cinemas and theatres wouldn't slow the spread (at least, if not reduce total number of cases) then Italy wouldn't be doing it, because economically it's a bit suicidal. So I expect the experts behind the scenes are the ones pushing for this. Aggressive containment has worked in Singapore, it's a shame our government is so late to follow suit.
I do think reducing travel will help prevent spread, and keeping kids off school too. And honestly, I think people should be doing this because though many people might make it through the vulnerable may well die, especially if hospitals become overloaded with cases very fast, and really is someone else's health less important than a face to face vs skype meeting, or going to a concert, the cinema or on holiday?
I think people are in denial, their world is being turned upside down and they don't want to admit it could be as bad as it is. But it is. Look at China, look at Italy. It's serious.
That doesn't mean we should panic, but it does mean we should take sensible measures NOW rather than when it's already too late. Why people are even debating going on holiday is beyond me. Travel = spread of disease. Far more so than staying home, just in terms of the number of people you'll have close contact with.