The article's argument in a nutshell: We need to break free from the tyranny of the characters on our keyboard, and express ourselves using characters not on our keyboard. So I hope you see why that argument keeps failing.
Your keyboard is not my keyboard, nor everybody else's. So I hope you see how US-centric your view is.
Before you hurl incorrect accusations at others, check out how international keyboards look. All have QWERTY-like (in some cases AZERTY etc. but still similar) layout as a BASE, and the local characters are on top of that. Yes even in China, Japan, Russia, Greece, Bulgaria, Macedonia and so on.
This is why languages center around this charset, and why it'll stay like that.