Some folks wouldn’t get in a plane post 9/11. Some folks won’t get in a plane post C/19. But most folks are going to travel again.
On the business front - one can keep up with old business relationships with Zoom and WebEx, but developing new business is still going to take face to face and expensive steak dinners.
International travel will mostly rebound, but it might take a few years.
CDC just claimed that unreported C19 numbers are 24 times reported positives. That is a big deal when trying to reopen the world.
For most folks the choice is not “no travel” vs “lots of travel”.
Since 2001 air travel has become a hassle—so folks just do less of it than they would have otherwise.
That is very hard to measure, since you can’t measure trips not taken.