I am indeed advising graduating and undergrad students to consider M.B.A. in order to maintain their currency in the workforce. an M.B.A. is worth it only insofar as to NOT have it severely disadvantages a person in the workforce.
As to out-of-work professionals, my recommendation is based on their age, and then this is layered on top fo the previous comment that I mentioned I make to graduating students. However, with so many online M.B.A. schools proliferating, there is a sense that the designation is becoming meaningless in large part. it would appear that the source of an M.B.A. is of less concern in academia than it appears to be in the non-academia world. I'd love to hear others' experiences or comments about this.