When all people on earth know the Tao (Dào, 道), what will happen ?

Описание: This question was once asked by someone in a comment upon a video about the Tao (Dào, 道) on YouTube I watched some time ago... I do not remember the name of the original video nor the commentor. However, the question inspired me and I thought about an answer from time to time. Thanks alot. This is what came spontaneously to my mind today morning, just after reading Alan Watts' "Tao: The Watercourse Way".