For the dozens and dozens of investors who have pumped $8.8 billion into making Uber the most highly valued startup on the planet, the events of this weekend must have caused some severe clenching of sphincters.

As was widely predicted and widely feared, cofounder and former CEO Travis Kalanick has decided to not go gently into that goodnight. Instead, he and the board are headed toward a showdown on Tuesday that could either permanently sideline him, entrench him even more deeply, or simply tear the company apart while leaving it practically ungovernable.

The only surprising thing, really, is that this duel is happening so quickly.