The consequences of Beijing showing the slightest hint of weakness are too great. The watershed moment will be, as the article observes, if/when PLA troops show up. These protesters are a new breed from the Tiananmen generation, and I don't see them going easily, putting all the ingredients in place for a big bloody bowl of suck.
I also saw a blurb about a virus hitting protesters' electronic devices and affecting communications, so the PLA cyber-warfare arm is likely already in the game.