Sorry. For quite a while, I was involved (as a trained monkey) for a compony doing AI as it's core product. Thus, unlike most people, when I think AI I don't think "way out-there research toy", I think "oh, god, why can't they write us tools that work instead of whining about how sandboxing is theoreticly impossible because of the halting problem". Speed matters for them. They did it all in Java, (which was a mistake; should have been C or C++, efficency).
Anyway, what I meant about inertia is more of an instutional thing. The compony I worked for wouldn't use perl, even for things like log-munging, for quite a while because the productivity-analisys tools that ate their CVS couldn't handle it. (The place wasn't always run the most sanely -- I no longer work there because they no longer exist.) You use the languages that your advisors know, and you use the languages that the journals publish, and you use the languages that the prior art is written in.
We are using here a powerful strategy of synthesis: wishful thinking. -- The Wizard Book