Long-term NYC resident here (I haven't hit my decade yet, so I'll avoid calling myself a New Yorker to dodge any ire). I've heard rumblings from a lot of people about moving out, mostly from people who haven't really set down roots here - which makes sense. The appeal of New York is largely all the stuff to do, and without being able to do stuff you're just stuck in a very small space that you pay a lot of money for.…
"I'm not leaving because of the virus, I'm leaving because because of the virus I can't go out" Strange distinction to make, isn't it?
A lot of the discussion revolves around mortality rates, and in particular about NYC as the US epicenter.
Most people I talk to who are thinking about leaving the city aren't concerned about their own risk as a result of being in a dense urban center, rather the lifestyle adjustments are the most difficult thing for them.
Granted that's almost entirely because most people I talk to are relatively healthy young adults who are being responsible and avoiding contact as much as possible, so they're not concerned as much about their own mortality or being a possible vector for others.