I think if you choose to fly in the near future out of the country and then there's a second lock down or lock down of the borders, that would suck since you wouldn't be able to get your family back home.
Or if there is a large cluster of an outbreak where you went on vaca in or out of the US and they won't let you leave the area, IE if NYC or HK got out of control they wouldn't let you in or out until they could control the outbreak.
I wouldn't fly in the near future, b/c we can't predict what's going to happen, and that uncertainty isn't worth the risk. It could be the airline you flown on stops flying, goes bankrupt, strike, etc. or Trump says/does something out of left field, this is not the time I'd want to be stranded somewhere after a relaxing vaca, won't be relaxing if something happens. But flights are cheap, so I'm sure some people are going. I mean the cruise lines still have some set to go in the near future, their risk tolerance is higher than mine for a 1-2 week vaca.