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Now, every time you hire an engineer they need to spend weeks or months learning Haskell on top of everything else. It now costs the business an extra 50K every time you get a new developer. I like Google's strategy of having the simplest language that anybody can pickup as fast as possible. Go.
There are more costs than onboarding costs. Also it's not hard to hire Haskellers or Haskell-adjacent devs. Haskell in fact makes you stand out. Those sorts of people don't need months. I've seen people new to Haskell make their first commits within a week. And they weren't geniuses or anything. But they also didn't have an attitude about it.
Seriously, what important industrial problems does it solve? Explain it to me like to a manager you met in an elevator. If you say e.g. lower bug rate, then be prepared to show some evidence (and no, please don't compare it to Python or other dynamic languages).