Ask your data scientists, who already use Python.

If they are opposed to Haskell or Go, then what are you going to do - fire them? Are you budgeting time/money to retrain them?

Your customers don't care what you use, unless you are selling them the actual software. (But then you would know what your customers want, and wouldn't be asking this question.

If you use language X because of a perceived marketing advantage that your customers will see you as "a cutting-edge, next-generation company" then can you estimate how much that marketing is worth? And compare it to other marketing approaches?

My view, as a long-time Python user, is of course Python.