don't always associate disaster with the existence of bitcoin or the future of bitcoin. After all this is still a local disaster, and it seems they are focusing on finding a safe place to avoid the corona virus, not to find alternatives about how to secure crypto assets. There are no economic disasters and no war disasters here.
Bitcoin can be affected by any massive disaster, specially in China where there are a lot of miners and traders. It has been reported that they are cutting out communications and transportations in certain regions of China in line of controlling of worsening the outbreak. So, that means their internet connection will be temporarily suspended.
On the other hand traders might suspend their daily trading routine as well, to secure their health as their priority at the very moment. Though this might only has slight effect on Bitcoin's price, but If you think any local disaster doesn't have effect on cryptocurrency market, well, come to think of these scenarios.
Agree, that it might be affected, and we all know that China is the big majority of bitcoin users and miners, so it might influence the price but not too much. The point here is when the Internet is down or something, miners and traders can't do their activity. The worst scenario is when the majority of those bitcoin users need cash and sell their bitcoin due to product's price increases during this plague.