I think a cross-country comparison clouds the issue. Think of it this way: if in an American city people started to frequently get sick from poor restaurant hygiene, would you expect them to eat out more, less, or the same? Would you expect them to be more or less willing to try restaurants new to them? My strong bet is on less for both, because people are pretty risk-averse when it comes to vomiting.
The US is in a very long restaurant boom: https://www.theatlantic.com/business/archive/2017/06/its-the...
And I don't think it's an accident that goes along with a large decline in food-borne illness rates: https://www.cdc.gov/foodnet/pdfs/FoodNet-Annual-Report-2015-...