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Let's imagine Facebook spends 2 billion on servers every year. If it could reduce the number of servers by 20% because of the better Go performance it would save 200 million every year.

Go outperforms HHVM by a wider margin than 20%. I've seen benchmarks as high as 50%. Sure, benchmarks aren't real world applications, but it's safe to say that generally speaking Go is significantly faster than HHVM.

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It would need a much higher return than your estimate if 20% to be worthwhile given the downsides (everything breaks, legions of engineers spend years figuring out how to do the migration). Also most systems end up being I/O or memory pressure bound, so the 20% number could easily be 0% or even negative.

PEOPLE ON THE INTERNET BE LIKE: "Let's rewrite everything in Go."

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