While I would like something like this, it is more probable than won't worth the investment at all. People is always looking that way to simplify everything. And reduce it to become a speed-run. There is already some dungeons with alternative paths at game launch. But they stop making them because no one care. Everyone follows a straight line in order to finish as soon as possible. The reason we don't have more labyrinthian dungeons or with more options is the behavior of players. They carefully study this to design the dungeons. So in the end, we get what we do. Probably they know don't worth making such dungeons, as people will try to speed-run and simplify as much as possible.