I ought to add that I cannot take seriously languages -- or libraries -- that do not have a de facto implementation which is OSS.

Well-known languages that fail this criteria: Java, C#, VB, the Lisps (although SBCL looks like it'll fix that), PL/SQL, ABAP.

If a business wants to tie their infrastructure to something over which they have no control, the managers are incompetent. It amazes me how many large corporations are more than happy to hand over the keys to their kingdom, so to speak.