They're being replaced by people taking fewer trips, and fewer people taking trips at all. By people taking road trips instead of plane/etc trips and having t

They're being replaced by people taking fewer trips, and fewer people taking trips at all. By people taking road trips instead of plane/etc trips and having their own car at their destination, or by choosing to visit friends/family and being able to use that person's car. And then of course there is uber, to mop up the remainder.