Some examples:
- Visit family, loved ones. E.g. births, weddings, funerals, etc.
- Recreation. If you don't live near a beach or national park you have to get there somehow. How 'bout that ski trip?
- Conventions, trade shows. Kind of hard to have hands on demonstrations of stuff via a video link. I suspect that having 100K+ people on one video call will be unmanageable.
- Some people actually have to touch stuff to do their jobs and that requires going to where that stuff is. I work on multi million dollar pieces of equipment that require special facilities to house them and I don't live near any of those locations. My commute is via commercial airline.
- Making high dollar purchases. Would you buy your next boat if you can only inspect it via a video chat? How are you going to accept delivery? Unless they drop it in front of your house, you're going to have to travel somewhere to get it.
And your post brings up a set of interesting questions.
-When will weddings and funerals resume? I wouldn't go to either in the next few months.
-Recreation-When will people start flying for it again? I think many will as soon as they can. Cabin Fever.
-Conventions and Trade Shows. Most have scheduled their next one for 2021. Will those be delayed longer if no vaccine by then?
-Business requiring hands on I think will resume as quickly as allowed. Right now there are a lot of people who need to go check on factories in China, especially companies that insist on ethical employment practices. I think Apple will have people in China as soon as allowed to travel there.
-High Dollar Purchases. I don't see much of that for at least the next year. In most cases we are treading new waters, but here we will likely see similar to 2008-09, just perhaps worse.
I think flying will resume as part of normal lives, just at a much lower level that before. Individuals will say, "Do I really want to go there?" and companies will say "Are you sure we can't do this by video?" There will be fewer airlines and should be less discounting although knowing the airlines there may be more.
Personally, I think it will be a long time before I get back on a commercial airplane as I don't have a lot of the reasons you posted. I think for a while, any travel I take will be charter. I still don't know who has been on the plane or who the pilots have been around, but I do control and know all passengers. I'll only do it though when I feel compelled to.