We can only get back completely to normal when one of the 3 things happen:
a) we get an effective treatment or vaccine, which seems unlikely to happen before 2021, though potentially it could be longer (hopefully not!)
b) we obtain herd immunity... Given about 7% have antibodies, and around 50% have antibodies in the worst affected place (Bergamo, Italy), we are unfortunately not close to this. If we collectively decided we had had enough and went back completely to normal over the next few weeks, we’d be back at square one by September in terms of infections and deaths. We could theoretically as a society set our faces like flint, carry on regardless, and refuse to lockdown as we did in March, and accept a death toll many times higher than we have to date, and push on until it burnt itself out.... but I can’t see that happening.
c) we collectively suppress it as a planet such that it disappears or mutates into something less severe. I’m not an expert but I believe it’s a fallacy to think this will happen whilst Covid is able spread readily in parts of the world as there’s no evolutionary pressure on it to make a change... a mutation will only succeed the current version is under severe reproductive stress and the mutation is able to propagate more easily.
It will be many months before any a) or c) happens, and we’d lose our collective nerve before we achieved b) unless we did it slowly over the course of a year or more.
However, many countries have suppressed it enough to get 90%+ of life back to normal. As long as infections get down to low enough levels, and testing and tracing is widespread enough, we can get back almost to normal by aggressively suppressing clusters when they arise without taking population wide measures. If we don’t screw it up as a society we’re probably a month or so away from this. That’s why it’s so important we don’t collectively let our discipline lapse.