How many people have characters bridge to other worlds? This has not happened in any game I played in for like 30+ years to the point that it is a non-starter. This also goes to
@the Jester ('s) point of having languages be something in you games.
While it makes sense to have common drift into something not the same as another common from another land/world, most play with common being able to talk with others in the game. A point could be made for other races and their language being solid and maybe from their gods to not change, but then there are worlds with things like 'old elvish' or something.