Has there ever been a study done of the costs of retraining an X programmer as a Y programmer? Talent availability is a huge factor for any development project; but if the software program clearly showed that Ada was superior, one wonders at the cost of taking all those experienced C++ coders and retraining them on Ada.

Ideally, such a study would show a matrix of the dominant language a coder uses, and the costs/time to get them comparably efficient in another language.