MBAs aren't the problem; a refusal to acknowledge a changed market and the reality of the digital world is.

And who do you think do this refusal come from?

Old people who don't grok the Internet. Not MBAs.

There is no doubt that anybody with an MBA is forever useless at anything but running steel mills and other places where what they have learned makes sense (at which they will no doubt be fabulous). I don't believe retraining is possible, for the simple reason that the average person doesn't change (individual people may, but on average they are average), thus no grand retraining is possible.