I would expect that countries will relax restrictions only bit-by-bit, and possibly also only when there's some level of confidence about who is safe from the dangers. Open up too soon and the virus explodes again; open up too late and, yes, there may be other risks from prolonged shutdown.
Statistics around Covid-19 paint a confusing picture right now, but the best estimates of the overall fatality rate seem to be honing in on the 0.5%-1% range, which, given its reach and ability to spread, is still a lot. It seems to be more dangerous than seasonal flu, for example, and certainly faster-spreading. Therefore, the fact that most people who get it recover is neither here nor there: if we allowed Coronavirus to spread across the country the death toll would be tremendously high, almost certainly in the hundreds of thousands, and on top of the background death rate at that.
It's difficult to weigh that against the effects of long-term shutdown. Hopefully there's a place to find a balance. I'd have thought that the UK Government's hope is to be able to certify people healthy (either immune or virus-free) so that economic activity could start to resume, although whether that will be achievable and how long it would take is anyone's guess.
Otherwise the only endgame is to hope that a vaccine is developed and mass-produced in record time, and that the virus doesn't mutate as frequently as flu.