There is no question that a mainstream language is a "safe" choice. No problems finding programmers, and lots of other companies you can point at doing the same thing if things go wrong.
in reply to Re^2: Choose the most powerful language
in thread Choose the most powerful language
The point of the original article is that there are times when the risk of going with a non-mainstream language is worth it. One of them is the case of a small startup where the founder (or someone close to the founder) is familiar with the language, and the language is very productive.
But try that in a larger company, and if anything goes wrong you're in trouble when people start questioning whether your odd choice had anything to do with the problem. Whether or not you chose wisely, you'll be a convenient target after the fact. :-(