International travel may never be the same, particularly if there is never an effective vaccine. It looks like the globe is breaking down in to areas where Covid-19 is effectively suppressed and other areas where it is not and herd immunity will be the eventual answer. Travel between the areas will require quarantine in at least one direction, limiting ad hoc travel and tourism.

International tourism and cruising may also lose their impact for social signalling. Both are at least partly motivated by the desire to come back and tell all your friends about where you were and what a wonderful time you had. The actual experience of having your pocket picked or being in a norovirus outbreak may not be all that great.