People with money will fly private jets... Unless there's a vaccine soon (and that's not likely) people people will fly less and less as time goes by...
People with money have been doing that and will continue to. The reason people won't fly as much in 2020 (which is more than 1/3 over) isn't lack of a vaccine (vaccine for COVID-19 is probably both a pipe dream and completely unnecessary) it is lack of an economic reason to go (for business travs) and lack of a recreational reason and/or financial resources to go have fun somewhere. OTOH, if the oil prices stay low for a while, it should be quite economical to fly.