Wrong. Nobody communicates solely via spoken language anymore. Our day-to-day vernacular is a combination of texting, speaking and ideogrammatical shorthand (¯\_(ツ)_/¯ for example). Since the advent of SMS we've been blending communication a lot more and our modes are no longer distinct. You can communicate "¯\_(ツ)_/¯" with a facial expression. You can communicate it with a meme. You don't need to know how to spell it because it doesn't need to be said - but there needs to be universal understanding of its meaning. There is universal understanding of "the usual" but there is not (yet) universal understanding of "the yoozh." With spelling like that, there isn't likely to be. Which means it remains trapped in one mode of communication - which makes it uniquely wounded in language. Which makes it a dead end.