"What's next for CSS? Probably CSS Current_Version+1, designed by committee [...]"

But this is the beautiful thing about popularizing the concept of compiling to CSS. Once you are liberated from the Browser's implementation a whole new world opens up. Experimentation can be conducted in languages that compile to CSS.

Right now the reason why we need a committee to decide what goes into CSS is that we all suffer the consequences if they get it wrong. With languages that compile to CSS, bad ideas only hurt that language.

Freedom for experimentation can only be good for CSS in the long run.