Isn't that a death ratio of 0.16%? That's way lower than for an old bloke laid up in hospital Wuhan, if the time comes I'll be self isolating on an all inclusive caribbean cruise.
Six deaths out of 700 infections is a death rate of close to 1%. Given that the infection has yet to run its course, it's likely that this rate will increase, sadly.
To put that into perspective, consider that, as
@Brompton Bruce says, there's about 12 million over 65's in the UK. The total infection rate from that cruise ship was close to 20% (700 out of 3700 people onboard). That suggests that we could expect 2.4 million infections in this elderly - and vulnerable - population. A mortality of 1% means 24,000 deaths due to Covid-19. Compare that to flu: the winter of 2017-18 was considered to be
exceptionally bad with about 350 deaths attributed to flu. Note that I've assumed that all those who become seriously ill get the treatment they require. In a major epidemic, that is unlikely: ICU places are a limited resource that will likely become overwhelmed. This is by no means the worst possible outcome.
I've based this on the Diamond Princess cruise ship outbreak - but these figures are reasonably similar to other sources: analysis of the infection rate gives numbers that indicate that between 30 and 60% of a vulnerable population will become infected. Data from China gives a mortality rate of 1-2% for elderly people.
The good news is that fewer people became infected than expected, especially considering the crowded conditions onboard a ship - that indicates that sensible precautions can make a significant reduction to the risk of becoming ill. There seems little justification in being complacent, but nor is there any need to panic. Over 95% of all infections are minor! Diligently washing hands and minimising your exposure to crowds and crowded areas will significantly reduce your exposure.