> Would I trade a 1000% performance hit on write ops in exchange for the ability to scale out over 10000% as many cores simply? Every day of the week.

And this is, in my opinion, the best possible argument in favor of using Clojure. Off the top of my head, I remember Rich Hickey saying something about how he developed Clojure due to his irritation at working on a huge project that wrote code to handle thousands upon thousands of interconnected nodes. That makes perfect sense.

However... writing a web app with Clojure, at least to me, doesn't.