As I see a temporary traveler

As I see it, a temporary traveler to return to his time "his reality" after having made a change in the past would need a link with that reality, that is: as long as the Einstein-Rosen bridge does not break and communicate the two points of space-time will not lose the link with "its reality". In this way, a temporary traveler could experience a new timeline, even spend years there without fear of not being able to return to the original time line "his reality."