I agree that the "there aren't enough programmers for language X" argument is generally flawed. Acceptable cases would be niches like maintenance of seriously legacy or dying platforms. COBOL anyone?
But, not because I think schools and colleges would jump at the opportunity and start training the next batch of students in said language just because some government department or a bunch of large corporations supported and/or mandated it. Mostly because that hasn't actually panned out in reality for as long as I can remember. Trust me, I _wish_ schools and colleges were that proactive or even in touch with with the industry needs, but... (shrug!)
Like I said, I still think the original argument is flawed, at least in the general case, because any good organization shouldn't be hiring "language X" programmers, they should be hiring good programmers who show the ability to transfer their problem solving skills across the panopticon of languages out there. Investing in getting a _good_ programmer upskilled on a new language is not as expensive as most organizations make it out to be.
Now, if you go and pick some _really obscure_ (read "screwed up") programming language, there's not much out there that can help you either way, so... (shrug!)