action items for css-in-js lib authors/consumers-
- prerender/ssr
- aggressively code split
- measure everything
- thank @slightlylatepic.twitter.com/n6gYaipQAr
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maybe it's not as obvious as I thought, but I'm just joking about CSS files 
I'm pretty sure this would be possible. Decide if a CSS value is static and extract them out (the majority) leaving only dynamic variables.
IIRC, this was the original use-case for the Open/Closed principle: ability to change a dependency w/o require rebuild of entire system
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