Maybe, but shares are already seen as way overvalued, partly due to the historically low interest rates, where people who want some return on their savings have put their money into shares, or houses. Peoples kiwisavers could also be badly affected depending on how it plays out and the fund they are in, and how the sharemarket reacts over the longer term. So these sorts of events can jolt big corrections.
Shares and houses are a massive bubble, if coronavirus causes a correction, it's the only good thing I can see coming out of it.
It is really the knock on effects that these cause that are the problem. NZ banks are highly exposed to NZ house lending. If they have lent more than the house is actually able to sell for, then they could have a massive problem.