I think there is cause to worry, but I think you're focusing on the wrong reasons.
The virus will be solved in time. We will either get a vaccine or herd immunity sooner or later. Once we achieve that, the flying will slowly return. The thing that most worries me isn't the virus scaring people, its businesses realizing they don't need to do all of this business travel anymore. They are learning during this pandemic that they can continue business as usual without flying people across the country and the world. Those business meetings they used to do in person, are now being done in the comfort of their homes via teleconference . This is what would worry me. Business travel makes up a very significant portion of the passenger demand and from what I can tell, a lot of that isn't coming back.
Take a look at the real estate market right now. Prices are soaring in suburban america because so many people have been told that they will never have to return to the office, so they are leaving the cities and buying homes in the suburbs. Commercial establishments all over the country are going to let their leases lapse and continue from this point on with their workforce's working from home. I fear the business travel will follow this trend.