[stubish]

You are underestimating how much language evolves. In fact, you are proposing brakes to stop if evolving. If nothing else, new currency symbols need to be incorporated every few years. The initial emoji were part of the actual writing systems of the world, even if it was relatively new and only being used by foreigners. Or maybe they have been part of world culture since the 1950s :-) ? https://en.wikipedia.org/wiki/Smiley